Off the shelf windows upvc

Turns out they weren't really builders. One was a baker. They pointed us to the builder. He wasn't happy that he was listed as a plumber because he didn't know about plumbing. Go figure. We asked "Is there a set of instructions on how to fit the windows? The opening was 10mm wider than the frame and 80mm higher than the frame.

We asked "Why the extra height? Answers were "No" and "Don't know". Further discussion - I can see that 30mm is for the cill but what is the extra 50mm for - and we were told that the extra space was for the trickle vent which was sold seperately and had to be fitted because of Building Regulations.

They then made a photocopy so we could take it away. I did suggest that they might like to make a couple more for future reference but I don't know if they did. The other thing that they did was to show us the clip another extra which you wouldn't know about until you had read the instructions which were sealed inside the window package which clipped into the outside of the frame and then protruded inwards or optionally outwards to be screwed to the wall.

This was obviously a potential problem The window is expected to go into a cavity wall opening so with a double skin wall there is plenty of depth. We are building a single block wall so the opening is mm. The frame is 60mm deep. So if you sit the frame back into the opening as is usual you don't have enough space at the back for the fixing.

Fortunately there is an alternative strategy - fit the brackets so they face outwards, drill in at an angle of 70 degrees then cover the screw and bracket with the silicone sealant bead you run round the outside. Subject to further checking this may be a feasible option. However there is another fly in the ointment. We are looking at windows which are mm wide. The dimensions on the package say that the opening should be mm wide. The instructions say that there should be a 5mm gap all round - presumably to allow for fine adjustment with packing to get the window exactly plumb, also to provide some depth to fit the brackets.

Mortar between blocks is 10mm. The window requires a gap of mm. There seems to be no logic in that particular window sizing given the accompanying instructions. I am then left with the question "Can I build the opening to the tolerance of 2.

Oh, and a supplementary. Instructions suggest that the gap around the window is packed with foam rubber to allow for expansion and contraction. Foam rubber? This is to be added after the window has been screwed into the opening and all additional packing pieces used to get the window true before fixing have been removed. We'll assume you're ok with this, but you can opt-out if you wish.

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