Any GRP roofers?

[single]

Conflicting info. on my google searches.I need to do some flowcoat bits on the boat and also a flat roof extension at home but what is the temperature/humidity for applying it? Some sites say 'over 5 degrees' but most say 'above 15'. I seem to remember doing it cold years ago and it was a mess.Also what happens to it if it is too cold or damp?

 

[CET1]

generally you need to change the catalyst ratio as the temperature drops. least temp for us would be 6deg C. but look on East Coast Glassfibre web site as they have a pdf download on grp roofing.

 

[PCUK]

Contact Glasplies, very helpful and supply both marine and roofing,

 

[ghostlymoron]

I wouldn't use GRP for roofing an extension. Its too rigid and difficult to seal to the rest of the structure plus differential expansion is a problem. There are some good butyl based membranes available and that is what I use these days.

 

[pcatterall]

Get it done quick or wait for spring. 10 degrees will be ok if you follow makers instructions re the mix. later in day when all has warmed up.

 

[srp]

I wouldn't use GRP for roofing an extension. Its too rigid and difficult to seal to the rest of the structure plus differential expansion is a problem. There are some good butyl based membranes available and that is what I use these days.

Agreed. Last bit of flat roof I did I used EPDM. A doddle to lay and fix, much cleaner than grp or hot pitch/felt, and a much better looking finish. Won't be much use for your boat though.

 

[PetiteFleur]

I wouldn't use GRP for roofing an extension. Its too rigid and difficult to seal to the rest of the structure plus differential expansion is a problem. There are some good butyl based membranes available and that is what I use these days.

Interesting thread - I'm just getting quotes for either GRP, or PVC(Sarnifil) for my flat roof joining my listed Lodge to a new extension. It has to be a 'Lead Look-a-Like' finish - the conservation officer won't accept EPDM or traditional felt. My local grp man guarantees it and he is by far the cheapest. I've seen some of his work and it's good. But will have to get it approved by the Conservation Officer......
Sarnifil is approved but I'm getting expensive quotes and reasonable prices for Sarnifil. How can the prices vary so much for the same product? If I go the Sarnifil route I will go for the cheapest quote, he turned up in his van and obviously was the guy who does the work whereas for the expensive quote the Sales Manager turned up in a very nice new car......
I like the GRP route as I liked the guy, he relies purely on word of mouth for his work and has worked for local grp firms before setting out on his own. One advantage of grp is that if it does get a leak or damage then it's very easy to repair, whereas Sarnifil apparently is almost impossible to repair after a few years as the material won't 'weld' together.
Decisions, Decisions.............

 

[ghostlymoron]

Interesting thread - I'm just getting quotes for either GRP, or PVC(Sarnifil) for my flat roof joining my listed Lodge to a new extension. It has to be a 'Lead Look-a-Like' finish - the conservation officer won't accept EPDM or traditional felt. My local grp man guarantees it and he is by far the cheapest. I've seen some of his work and it's good. But will have to get it approved by the Conservation Officer......
Sarnifil is approved but I'm getting expensive quotes and reasonable prices for Sarnifil. How can the prices vary so much for the same product? If I go the Sarnifil route I will go for the cheapest quote, he turned up in his van and obviously was the guy who does the work whereas for the expensive quote the Sales Manager turned up in a very nice new car......
I like the GRP route as I liked the guy, he relies purely on word of mouth for his work and has worked for local grp firms before setting out on his own. One advantage of grp is that if it does get a leak or damage then it's very easy to repair, whereas Sarnifil apparently is almost impossible to repair after a few years as the material won't 'weld' together.
Decisions, Decisions.............

Can you get sarnie fill in different flavours? e.g. Cheese and onion or prawn mayonnaise

Seriously when I looked into it for a municipal project I was specifying, I had serious doubts about the expansion and contraction rates for GRP whereas Butyl (or EPDM) is very good in this respect.