Download Roof Insulation Guidelines

KSN ENERGY – BETTER ENERGY COMMUNITIES
2016 Pre-Start Meeting
KSN Energy June 2016
M Mullen & R Ua Fearghail
2015 Results Overview
•
66% of houses inspected in 2015 passed.
•
8 projects had 100% pass rate for all inspections
Most Common Reworks (Contractors with less than 70% Pass rate)
o Roof ventilation (10% of roofs inspected)
o Cavity wall ventilation (24% of CWI inspected)
o External wall insulation – not covering accessible area (19% of EWI inspected)
o Heating – Immersion heater timer (12% of inspected)
Technical Specification 2016 Introduction
Specifications are based on the following documents:
•
Better Energy Scheme – Contractors Code of Practice and Standards and Specification Guidelines – Version 7.0
http://www.seai.ie/Grants/Better_energy_homes/contractor/Code-of-Practice-Rev-7-1-2016.pdf
•
NSAI S.R.54:2014 – Code of practice for the energy efficient retrofit of dwellings: http://www.nsai.ie/S-R-54-2014-Code-ofPractice.aspx
•
Relevant building regulations
http://www.environ.ie/housing/building-standards/tgd-part-d-materials-and-workmanship/technical-guidance-documents
Heating
•
SEAI are holding a separate workshop specifically to address heating
installations.
•
This is to be held on the 13th of July in SEAI’s Wilton offices
•
All heating elements will be covered on the day
•
There will be presentations given by KSN, The heat pump association
of Ireland, OFTEC and RGII
•
•
Measures covered will include:
•
SEAI heating inspections
•
Oil storage and oil supply
•
Heat pumps
•
Stoves
There are limited places 2 per project guaranteed but we will try to
accommodate all requests where possible.
•
Heating installers are urged to attend
Ventilation overview
There are 2 main points to note when assessing ventilation;
•
Fuel poor- Better Energy Warmer Homes spec (where advised is mentioned this has to be
installed)
•
Non-fuel poor- Better Energy Homes spec (where advised is mentioned this can be assessed
by home)
What measures will this affect;
•
Wall insulation
•
Attic insulation
Table 30 – SR54
Existing dwelling condition
Retrofit works
1
Internal/External/Cavity
insulation for walls
2
Replacement of windows
3
Sealing/insulating
of timber
suspended floors
4
Two or more of the
above measures
done in combination
or separately
A. No existing background
ventilation in some or all
habitable rooms and no
extract ventilation in wet
rooms
B. Existing purpose provided
background ventilation in
each habitable room. No
extract ventilation provided
in wet rooms
Background ventilation should be provided
to rooms without background ventilation in
accordance with Column 2, Table 31
No requirement to upgrade background
ventilation.
It is advised to provide extract ventilation in
wet rooms in accordance with Column 3,
Table 31
It is advised to provide extract ventilation in wet
rooms in accordance with Column 3, Table 31
C. Existing purpose provided
background ventilation in
each habitable room. Extract
ventilation provided in wet
rooms
No requirement to provide
2. further ventilation
Where evidence of inadequate ventilation Where evidence of inadequate ventilation exists
exists (e.g. mould, condensation) - extract
(e.g. mould, condensation) - extract ventilation
ventilation should be provided to all wet should be provided to all wet rooms in accordance
rooms in accordance with Column 3, Table
with Column 3, Table 31
31
No requirement to upgrade
background ventilation
No requirement to provide
Extract ventilation should be
further ventilation
provided to all wet rooms in
accordance with Table 31
NOTE Covered/Damaged covers on ventilators should be replaced with equivalent or better. Deficiencies or faults in
ventilator grills or fans should be rectified and returned to intended working condition.
Background and extract
ventilation should be
provided in accordance with
Table 31
NOTE Where ventilation exists and severe conditions of condensation or mould growth have developed, specialist advise should be sought.
Table 30 S.R. 54:2014 Code of practice for the energy efficient retrofit of
dwellings, Ventilation Pg. 164
SR54 Table 30 – SR54 Interpretation for fuel poor homes
Existing dwelling condition
Retrofit works
1
Internal/External/Cavity
insulation for walls
A. No existing background
ventilation in some or all
habitable rooms and no
extract ventilation in wet
rooms
B. Existing purpose provided
background ventilation in
each habitable room. No
extract ventilation provided
in wet rooms
Background ventilation must be provided to
rooms without background ventilation in
accordance with Column 2, Table 31
No requirement to upgrade background
ventilation.
It is must to provide extract ventilation in wet
rooms in accordance with Column 3, Table 31
2
Replacement of windows
It is must to provide extract ventilation in wet
rooms in accordance with Column 3, Table 31
C. Existing purpose provided
background ventilation in
each habitable room. Extract
ventilation provided in wet
rooms
No requirement to provide
further ventilation
Where evidence of inadequate ventilation Where evidence of inadequate ventilation exists
exists (e.g. mould, condensation) - extract
(e.g. mould, condensation) - extract ventilation
ventilation must be provided to all wet rooms
must be provided to all wet rooms in
in accordance with Column 3, Table 31
accordance with Column 3, Table 31
NOTE Covered/Damaged covers on ventilators should be replaced with equivalent or better. Deficiencies or faults in
ventilator grills or fans should be rectified and returned to intended working condition.
NOTE Where ventilation exists and severe conditions of condensation or mould growth have developed, specialist advise should be sought.
SR54 Table 30 – Interpretation for non fuel poor homes
Existing dwelling condition
A. No existing background
ventilation in some or all
habitable rooms and no
extract ventilation in wet
rooms
Retrofit works
1
Internal/External/Cavity Background ventilation must be provided to rooms
without background ventilation in accordance with
insulation for walls
Column 2, Table 31
It is advised to provide extract ventilation in wet
rooms in accordance with Column 3, Table 31
2
Replacement of
windows
4
Two or more of the
above measures
done in combination
or separately
Where evidence of inadequate ventilation exists
(e.g. mould, condensation) - extract ventilation
must be provided to all wet rooms in accordance
with Column 3, Table 31
B. Existing purpose provided
background ventilation in
each habitable room. No
extract ventilation provided
in wet rooms
C. Existing purpose provided
background ventilation in
each habitable room. Extract
ventilation provided in wet
rooms
No requirement to upgrade background ventilation.
It is advised to provide extract ventilation in wet rooms in
accordance with Column 3, Table 31
Where evidence of inadequate ventilation exists (e.g.
mould, condensation) - extract ventilation must be
provided to all wet rooms in accordance with Column 3,
Table 31
No requirement to provide
further ventilation
No requirement to upgrade
background ventilation
Extract ventilation must be
provided to all wet rooms in
accordance with Table 31
NOTE Covered/Damaged covers on ventilators should be replaced with equivalent or better. Deficiencies or faults in
ventilator grills or fans should be rectified and returned to intended working condition.
Background and extract
ventilation must be
provided in accordance with
Table 31
NOTE Where ventilation exists and severe conditions of condensation or mould growth have developed, specialist advise should be sought.
Mechanical extract ventilation notice
In non fuel poor homes, where the homeowner is advised but decides
not to have mechanical extract ventilation fitted. The following must be
done:
•
The SEAI guidance note must be issued to the homeowner
•
http://www.seai.ie/Grants/Better_energy_homes/contractor/Newslet
ter/Important-notice-in-relation-to-mechanical-extract-ventilation.pdf
•
A signed copy must be kept by the project coordinator.
•
This should be scanned and sent to [email protected]
Table 31 - Minimum levels of background and extract ventilation
as specified by Table 30
Room usage
Minimum background
ventilation (mm2)(d)
Intermittent extract fan rating (l/s)
Habitable room
6 500
Not required
Kitchen(a)
6 500
60 (reduced to 30 for suitably
sited extracting cooker hood)
Utility room(a)
6 500
30
Bath or shower room(b)
Not required
15
WC (only)(c)
Not required
6
a) Where the room has no external wall, a floor area of less than 6,5 m2 and background ventilation cannot be provided then
extraction fan to operate with a 15 minute overrun etc.
*
b) Where the room has no external wall and background and purge ventilation cannot be provided then the extraction fan
should operate with a 15 minute overrun etc.
c) Where a window opening for purge ventilation exists then the window alone may be relied upon to provide extract
ventilation.
d) Ventilation area as stated above is free area. Equivalent area is measured in accordance with the method specified in I.S.
EN 13141-1: 2004. The above values should be multiplied by 0,8 to obtain equivalent areas.
Table 31 S.R. 54:2014 Code of practice for the energy efficient retrofit of dwellings, Ventilation Pg. 165
* Ventilation for WC’s is not provided for BEWH Scheme
Table 35 - Guidance for the provision of adequate
supply of air for combustion appliances
Retrofit Works
1
2
3
A. No existing supply of air in room
containing a fixed open flued appliance.
B. Adequate supply of air provided in
each room containing a fixed open flued
appliance.
Wall Insulation, window replacement or
sealing/insulation of suspended floors carried
out BUT NO new open flued appliance fitted.
No requirement to upgrade permanent
Permanent ventilation should be provided
ventilation. Recommended to ensure
in the room containing the appliance, (see
ventilation is unblocked, in good
note).
condition and permanently open.
New open flued or flueless appliance fitted.
This work falls within the Building
This work falls within the Building
Regulations Part J - Heat Producing
Regulations Part J- Heat Producing
Appliances. See TGD J for further
Appliances. See TGD J for further guidance.
guidance.
Provision of new balanced flue appliance
This work falls within the Building
This work falls within the Building
Regulations Part J - Heat Producing
Regulations Part J- Heat Producing
Appliances. See TGD J for further
Appliances. See TGD J for further guidance.
guidance.
NOTE This permanent ventilation will also suffice for Background ventilation, see clause 10.
Table 31 S.R. 54:2014 Code of practice for the energy efficient retrofit of dwellings, Ventilation Pg. 180
Wall Ventilation
Note: New permanent and background vents are advised to be certified to IS EN
13141-1: 2004
Wall Ventilation
•
•
•
•
Where open flued appliances are present extract ventilation should not be installed.
This accounts for all fuels: Oil, Gas and solid fuel.
This accounts for all rooms e.g. kitchens and utility rooms.
Gas cookers are not open flued appliances and therefore are exempt.
No extract ventilation to be installed where these are present
Wall Ventilation Technical Specification 2015
When do I need to install ventilation
•
All rooms that have had wall insulation installed must be ventilated as per SR. 54
•
If insulation has not been installed in a room then no ventilation is required.
•
Examples of this can be occasionally found in Dormers.
•
A handy rule will be to ask yourself is have I insulated any walls in this room? if the answer is no then no
ventilation is required extract or background ventilation.
No wall insulation
Insulated walls
Wall Ventilation
•
ventilating open flued appliances through adjoining rooms
•
Open flued appliance use the air in the room for combustion
•
If there is no air there is a risk of carbon monoxide
•
For safety where there are open flued appliances in internal
rooms in a property:
•
A vent between both rooms should be installed. The vent
in the adjoining room should have a free area no smaller
than the ventilator to the outside.
Open flued
Room sealed
• What if there is existing ventilation?
•
If a room requires a background ventilation and there is an existing hit and miss vent but it’s cover is painted
closed what should I do?
•
•
If a room requires permanent ventilation and there is an existing hit and miss or trickle vent what should I do?
•
•
An extract fan should be installed in the wall with back draught dampers.
What if extract ventilation is present but it is not working?
•
•
The preference is to change the vent cover to a permanent cover. If this is not practical e.g. a nonstandard trickle vent then the vent should be fixed open with a small screw.
If a cooker is situated where it is impractical to duct it to the outside what should I do?
•
•
Covered/Damaged covers on ventilators should be replaced with equivalent or better. Deficiencies or
faults in ventilator grills or fans should be rectified and returned to intended working condition.
The homeowner should be advised to get their vent repaired.
What do I do if I come across extract ventilation that is not ducted to the outside?
•
The fan should be ducted to the outside correctly.
Extract ventilation.
2016
•
Bathroom fan locations
•
As per ET-101 National Rules for Electrical Installations table 701 A: Extract fans should
not be installed in zones 0,1 and 2 unless they are of the extra low voltage type
Fans should not
be installed in
these zones
Extract ventilation.
•
Surface conduits.
•
Surface conduits or trunking should be kept to a minimum. Care should be taken when choosing
positions to minimise the amount of trunking installed.
•
Floorboards should be lifted
Alternate position
could have reduced
trunking
Extract ventilation.
•
Electrical isolation.
•
Again floor boards should be lifted in these instances
•
Also there is a requirement for a fan isolation switch. As per ET-101
National Rules for Electrical Installations, “an extraction fan shall be
provided with an isolating device in its vicinity which switches all
phase/line conductors”.
•
“Where a fan and a light are controlled by the one switch isolating devices
shall be installed downstream of that switch”
Reminders
Wall vents
Insulated ductwork: Ducting passing through unheated spaces needs to be insulated
Back draught dampers: Where wall mounted extract fans are installed, dampers
should be provided on the outlet to reduce draughts.
•
There are numerous options for backdraught dampers
•
An acceptable alternate would be to fit a fan with a closable cove as shown
below:
Wall Ventilation
• Gas Cookers-as per part J
Vent terminal locations
Wall vents
When installing wall vents care should be taken when positioning the vent. The distance from gas and
oil boiler flues is an important consideration. Below are the minimum distances flues should be kept
from certain items. This information can be used to determine the distances vents need to be kept from
flues.
Gas
Vent terminal locations
Wall vents
When installing wall vents care should be taken when positioning the vent. The distance from gas and
oil boiler flues is an important consideration. Below are the minimum distances flues should be kept
from certain items. This information can be used to determine the distances vents need to be kept from
flues.
Oil
Roof ventilation:
Fuel poor homes:
•
As per TGD part F
Non-fuel poor homes:
•
SEAI advise that all work should be done as per TGD part F
•
No existing ventilation should be compromised
•
Where evidence of distress due to lack of ventilation exists e.g. condensation, staining. Ventilation must be
installed as per As per TGD part F
Roofs
The next slides will describe what is meant by various roof
types so that we collectively are using the same
terminology:
•
•
•
•
•
•
Pitched Roof
Flat Roof
Dormer Roof
Storey and a half Roof
Mono-pitch Roof
Lean – to Roof
Terminology is very important!
Dormer Roof:
A roof which contains a room within it.
Identifiable by having a crawl space adjacent to room.
There are different versions of dormer roofs.
Spray foam roof insulation:
Where spray foam insulation is being installed it must:
•
Be installed as per NSAI certificate
•
Meet the required U-Value
•
Meet ventilation requirements 25mm2 equivalent
•
Make for a whole surface solution
•
including a ventilation void between the underside of the felt
Attics
Positioning of Vent Tiles / Slates
To be positioned above insulation. Max 300mm above insulation preferable. We acknowledge this may not be
possible adjacent to valleys.
Not to be positioned below insulation.
Guidance from Page 271 of SR54, Figure H.8
Attic Measures
Two thirds rule.
Do not take account for any
existing ventilation located
here
Where the ceiling to be insulated is greater than 2/3’s of the floor area below the
ceiling, attic insulation can proceed. This however is not possible in dormer roofs. It
will be applicable to storey and a half type dwellings.
Existing ventilation: Where a property has existing ventilation this should be
assessed on site. The type of ventilator in Fig A. should be measured in
increments of 50mm with an allowance of 1250mm2. e.g. a 200mm soffit
ventilator will deliver 5000mm2. The type of ventilator seen in Fig B. can be very
difficult to asses and tend have quite small openings. Therefore we do not make
allowances for these.
Fig. A
Fig. B
Avoiding Common Fails - Roof Ventilation
Roof ventilation requirements are as follows;
•
Cross ventilation must be achieved
•
10mm (25mm for dormer, flat roof) equivalent is
required within the soffit using soffit vents or roof
vents positioned at low level on the roof slope
•
5mm equivalent is required at high level as per BS
5250:2011 to provide ventilation if the roof pitch
exceeds 35° or the wall plate to wall plate distance
exceeds 10m
•
High level ventilation must be calculated correctly for
a hipped roof construction as per BS5250:2011
Mould growth in 18 months
Downlights-fire risks
• Recessed downlighter not
covered with downlighter cover.
• Poor detailing
• Spot lights protected
• Downlighter covers must be used purpose made recessed down-light
covers installed must be tested to BS
EN 60598-1 Luminaires . General
requirements and tests
Avoiding Common Fails – Electrical Penetration
Cables pulled up over insulation
Avoiding Common Fails - Hatch Insulation
Hatches must be insulated to same standard as rest of attic
Mineral wool type insulation with a thermal conductivity of circa 0.044 = 300mm Insulation
to hatch
Aeromark type rigid insulation board with a thermal conductivity of 0.031 = circa 225mm
Polyurethane rigid insulation boards with a thermal conductivity of 0.022 = circa 150mm
All of the above thicknesses will provide a basic U-Value of 0.16W/m2K. Please note that
this is a basic value and does not allow for thermal bridging and other contributing factors
Draught proofing:
Draught proofing hatches
• Good compression must be maintained alternatives are available to the common
hooks and eyes:
• Where access ladders are present maintaining insulation depth may not be
practical but some effort should be made to install some level of insulation. This
may also be applicable with the draught proofing.
Avoiding Common Fails – Walk Boards
Walk boards are required from the attic access to the ball valve of all water tanks. This includes (F&ET) feed and
expansion tanks. If the tank is located in close proximity to the attic hatch, it must be assessed if it would be
necessary to provide a walkboard at this location for somebody to stand on if carrying out repairs / work in this
location.
Contractors to install insulated walk board or board fixed to 50 x 50mm and batten insulted underneath.
Walk board is to be a minimum of 19mm thickness 450mm wide flooring grade chipboard. It is to be screw fixed
to the joists. They must start and finish on a joist to be adequately supported
Walk board width not to scheme
specification – 300mm not acceptable
min.450mm
Walk board not safely
accessible at entry to attic
Avoiding Common Fails - Pipe Insulation
•
All pipes containing water must be insulated
•
All sections of pipework must be insulated including bends, valves and
joints
•
Insulation must be correctly fitted and secured
•
Thermal conductivity of insulation shall be as per Appendix Table 1 for
TGD Part G of Building Regulations
•
If pipe bore ≤ 40mm, pipe insulation thickness should be equal to the
outside diameter of the pipe
•
If pipe bore ≥ 40mm, pipe insulation thickness should be 40 mm
Avoiding Common Fails - Pipe Insulation
Joints are fully covered and sealed
Good quality of insulation used throughout
Pipes sealed the whole way into the tank
Avoiding Common Fails – CWST and F&E Tank
Tanks are to be fully insulated and
fitted with lids if insulation is installed
at joist level
Tank to be insulated
throughout including
underside if above 300mm
from joists
Please ensure all
expansion pipes are not
above the tank jackets
Avoiding Common Fails – CWST and F&E Tank
Tank with no insulation or lid fitted
Quilt “skirted” up around
underside of tank
Tank insulation not held
in place
Avoiding Common Fails – Electrical Penetration
Electrical Penetration
The 6sq and larger cables shown here
must NOT be covered with insulation.
These are generally mains cables / cooker
cables and electric shower cables.
Check all electric shower cables and cooker
cables. These appliances require heavy
duty cables but may have an incorrect
cable installed, making them more
dangerous if covered.
Any Questions…
Contact Details - KSN Energy
KSN Energy Contact Centre 01 277 6977
Ruaidhri Ua Fearghail
[email protected]
01 2776918
James O’Riordan
Mat Mullen
[email protected] [email protected]
01 277 6911
01 2776946