I am building a lean-to conservatory and have a slightly unusual setup. Due to getting a good price on one, but it being too small, I am using a flat roof (draining to the side) between the conservatory and the house
- this also gives a useful escape route and a working platform for house maintenance.
Due to various constraints, I have needed to keep the overall height down, therefore rather than using firrings on top of the timbers, I have the "flat" section of the roof between the joists. This means that the conservatory butts up to a horizontal timber joist, with no height difference.
My intention is to fibreglass the flat roof, particularly as I fibreglassed the flat roof of the existing extension around fifteen years ago and it's still fine.
I am still deciding how to waterproof the joint between the conservatory and the joist and have considered making a fibreglass cap running a short distance over the roof of the conservatory, over the joist and a few inches vertically down the other side. My intention is that this should not be a permanent part of the roof, but instead should be removeable, so as to allow the glazing bar caps and roof sheets to be removed if required.
The obvious way to make this is to put something on the roof that will allow the fibreglass to be released, make the cap in situ and then remove it to place a self-adhesive sealing strip or similar under it. the question is, what to use as the release medium?
Tinfoil would work, but is eaily torn during working and will not adhere to the roof to keep it in place while I work; clingfilm will self-adhere but may shrink and tear under the heat of the fibreglass curing.
Any comments, experiences or suggestions appreciated.
SteveW