tegwin
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| posted on 28/3/11 at 07:07 PM |
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OT Anyone built a warm flat roof before?
I am planning to replace the roof on the garage next week....
So far the plan is to fit new beams, lay a suitable deck and then put insulation on top of the deck before wrapping the entire thing in EPDM...
This seems to be an acceptable thing to do, but I am not sure what insulation to go for. Obviously the insulation and EPDM will need to be glued
together on the roof... But the cheaper pinky type insulation foams melt when you waft some glues at them....I could try a water-based adhesive...
Just wondered if anyone had any experience of building an insulated roof like this and could make some useful comments :-)
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zilspeed
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| posted on 28/3/11 at 07:37 PM |
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I've a job just about to go on site and we're using this system on it.
http://www.icopal.co.uk/Products/Roof_Ins
ulation_Boards/Thermazone_TorchTop_Roof_Insulation_Boards.aspx
The roofing membrane we're using is this one.
http://www.icopal.co.uk/Products/Bit
umen_Roofing/Firesmart_Roofing_Membranes/FireSmart_Torch_On_Roofing.aspx
This is a fire damage reinstatement job.
It's all torch on.
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van cleef
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| posted on 28/3/11 at 07:38 PM |
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With a rubber flat roof you use mainly water based adhesives in the middle and you only glue a foot in from the edge's with contact adhesive.
In my experience you can cut the insulation between the rafter's then deck it and apply your epdm
Or you can deck it first then lay your insulation down then deck again on top of the insulation using long enough screw's to sandwich your
insulation but if you have facia board sides where a drip is used for the water to be displaced into the gutter you will have to bring the facia board
up to the top of the upper edge of the upper deck.
I'm a roofer by trade and an approved Firesone epdm fitter.
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Volvorsport
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| posted on 28/3/11 at 07:51 PM |
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yes .
insulation (kingspan) is normally used in 50, 100 150 depths, it can be graded to produce a fall , but will need another layer of ply on top before
you apply the weather proof coating .
ive done work for polyroof before , check their website .
it really depends if you need it signing off by someone like the council .
www.dbsmotorsport.co.uk
getting dirty under a bus
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tegwin
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| posted on 28/3/11 at 08:00 PM |
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Im not getting it signed off.... Its a simple "repair existing roof" job.... Although I will be building it to "regs"...
Its only a garage/workshop... Fitting the insulation under the deck between the joists is the easiest option, but will this cause issues with regads
damp/condensation in the deck?
I have a slight issue..because the garage is on a boundary the max roof height is 2.5m... so if I can insulate under the deck in the rafters instead I
can have a higher ceiling inside... 
[Edited on 28/3/11 by tegwin]
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martyn1137
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| posted on 28/3/11 at 08:06 PM |
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Check out the Kingspan Insulation website. I believe they or their competitors make a ply faced insulation specifically for a warm deck roof.
But.............
.....why are you building an insulated roof. Is the garage to be heated? You will loose loads of heat through the walls and doors if it is just a
standard garage.
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tegwin
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| posted on 28/3/11 at 08:12 PM |
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Its a single concrete block wall garage... Just figured that if I am fitting a new roof...might as well insulate it if I can keep cost down... Keep
it warm in winter and stop it cooking in the summer... black rubber roof and all..
Am I being a silly!? Just leave it un-insulated and save £150 or so...
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martyn1137
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| posted on 28/3/11 at 08:52 PM |
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From what you have described I would get hold of some cheap rigid panel insulation; wwwsecondsandco.co.uk could be a good source. Then fit it between
the joists. Use a plywood decking over for the EPDM.
That way you are achieving your aim of minimising heat build up, and retaining any heat you introduce. The use of a warm deck roof is primarily to
avoid the effects of condensation within a sealed structure. In most cases it is over a heated space. Also you will not be increasing the garage roof
height or reducing ceiling height.
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tegwin
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| posted on 28/3/11 at 08:56 PM |
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That is my thinking at the moment, my only concern was condensation between underside of deck and insulation... but I guess in a garage its not going
to be an issue really!?
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Would the last person who leaves the country please switch off the lights and close the door!
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martyn1137
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| posted on 28/3/11 at 08:59 PM |
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Not enough of an issue to warrant a warm deck roof!
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