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My extension flat roof is L-shaped ('wrap around extension'). I have T&G OSB for the roof, but I can't think of a way to use the T&G for every joint as some of the joist spacings aren't 600mm. I think I will need to cut some and just leave an expansion gap (3mm IIRC). Is this what people do in...

My UPVC has gone yellow where I sprayed the activator for Mitre Bond. I've tried Isopropyl, UPVC cleaner and water, but they don't seem to make a difference. How do people usually deal with this? I could try using a cream cleaner, but that will be a polish and will change the finish, so that's...

Timber is a good idea. Blocks will be cheaper as I already have them, but timber would be much quicker I'm planning to continue my insulation (Dritherm 32, not PIR) through the cavity either way.

I don't want air flow. I will be having MVHR in my main room. The other 'room' is a garage, so air flow doesn't really matter in the garage.

I'm doing a flat roof with joists sitting on a block wall. I'm planning to put blocks between each joists i.e. almost 600mm between the joists. I was wondering how high the blocks should go and perhaps what their purpose is? Are they just there to prevent twisting of the joists? Is it best to...

I'm not sure what you're describing, but it sounds like it could be a good idea. What sort of straps do you mean? I've also just had the idea of bolting timber (like a wallplate) to the underside of the steep and then using something like truss clips with twist nails. So it'll be like a wall...

I would lose head height, need to remove and cut blocks, and have additional timber to raise the height, so I don't really want to do that. I may also need to rethink locations of pipes etc. It's a garage, so the additional height would allow more storage. I'm hoping that there would be an easy...

I have a timber joist that will sit on a steel beam and will support a flat roof. It will also meet a pitched roof as shown in the picture below. I was wondering whether a screw would be adequate to prevent uplift or whether something like nails would be required? I would also put some blocking...

I've done some Googling and thinking and came up with this idea . I haven't put the EPDM in the illustration, but it would cover the OSB and go under the eaves tray. The eaves tray would also have the added benefit of preventing the tiles from doing any damage to the EPDM. I would probably put...

I can't think of a good way to transition from a flat roof to a pitched roof. I found this article https://www.rubberroofingdirect.co.uk/training-hub/pitched-roof-slopes-onto-the-flat-roof-fleece-backed, but would this design seems to have lost the gap between the trusses, so surely water could...

I didn't need to double nail them . I got mixed up with the bracing, which should be double nailed. My bats are the larger 50mm ones, so I managed to get the nails in ok, and it was pretty quick with a nail gun. At least I know they're secure

I've just done the roof battens for my extension and realised that the battens should span at least 3 trusses. I have two, which are only spanning two trusses at the ends. Do I need to replace these or is it fine? They are currently secure and double nailed everywhere, so I don't really want to...

Redland Regents. They're pretty big.

They do, but ridge tiles don't, I believe the eaves tiles need two mechanical fixings and with the verge it would depend whether I have enough tile (more than half) for a nail.

Are mechanical fixings required for verges/ridges etc. on an extension? My understanding is that they are, but it's very hard to buy mortar bedding kits and tile clips, which makes me think that nobody does them. My local roofing place didn't even know what a tile eaves clip was My existing...

I have a small pitched roof and will be putting lateral restrain straps at the gable. The diagonal bracing gets in the way though. Can I do 22mm boards each side of the diagonal bracing and then go across all of it with the strap or should the strap be on a single piece of timber? If that's not...

I was going to do that originally, but noticed something that meant I couldn't do it. IIRC there is a minimum size. I want to ply/osb it anyway, but I think I still need the diagonal bracing. If I had started from the other end then it would have been ok as the house is only on one side. I...

Yes, going down to the wall plate.

I don't think so. I think it's just generic instructions they have and not specifically for my roof.

I'm doing diagonal bracing on my small (3.5m span, but 6.0m wide) attic trusses, and I've found that I can't get the last one in as my existing house is in the way. I was wondering whether they need to alternate between up-down, and down-up, or whether two can go in the same direction? I'm...