Can Fibrelast be applied over shed felt
I have a felt roof on the top of my garage and wanted to know if I can apply your Fibrelast GRP roofing materials directly over the top without using any OSB decking.
John Shury
Staff member

While it can be done, it’s really not recommended and could cause you all kinds of problems in the future. Always better to be safe than sorry and put that extra bit of cash into stripping the existing surface, laying some fresh boards and applying from scratch.
Posted on Jan 19th, 2018
Similar questions
How many expansion joints are needed for a GRP roof?
We have a roof that's 54 square metres and I know from your Fibrelast guide that we need to use…
Will the sun discolour a GRP roof?
I have a south-facing roof that gets the sun all the time and want to know how the coloured topcoat…
Can I use Fibrecoat without the glassfibre?
I have a project to do that involves coating a concrete roof which is around 50 square metres and…


While it can be done, it’s really not recommended and could cause you all kinds of problems in the future. Always better to be safe than sorry and put that extra bit of cash into stripping the existing surface, laying some fresh boards and applying from scratch.
If you want to over-coat your existing surface, I would recommend you check out Fibrecoat or Overkote.