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I'm in the process of building an extension which has a metal roof (probably Greencoat PLX) specified. I'd like to kick the cost of the metal roof down the road a bit and was wondering if I can install Fibreglass coating now to make the structure weather tight and lay the metal roof on top of it at a later date? In short, can you lay a metal roof on top of fibreglass (with structural underlay) or is this a no-no?

I had the offer of some help from a neighbour so decided to crack on with the roof sheets. These are corrugated sheets 4x1m and in the thicker 0.7mm spec, so fairly heavy and awkward things to handle. I did get the first sheet up and fixed by myself but am not daft enough to turn down an offer of help when it appears! When I bought the roofing, I had recently read @ProDave's less than glowing review of Jewsons' plastic headed roofing screws, so made a point of asking what would be supplied. The guy at the BM was adamant that everybody these days prefers the plastic headed stuff, quicker to install, no caps to come loose, just a question of getting the right bit to drive them in with. He even did a straw poll of the people in the shop at the time... Anyway, how do the screws work in real life? They certainly do not self drive, not by a long shot. And so far I have stripped the heads off two of them, although in both cases I was able to back the screw off and remove it using pliers. So it seems you need a decent hole punched in the sheet, which slows down installation somewhat. Getting the sheets up on the roof wasn't too hard once I figured out a method- I built a 'stretcher' to hold each sheet, and this is then run up a pair of wooden guide rails onto the roof. Doing the last sheet will be a bit tricky as we will have to pull the 'stretcher' out from under it, instead of moving the sheet to the side as we have been doing so far. In other news, the hole for the flue is now made- a bit daunting cutting a whopping great hole in the roof! I'll write another blog post about that as part of the stove installation,