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Notwithstanding the snow load calculation method, the problem is that I am limited to a 65/70mm concrete lintel because I need height for the wall plate, but these concrete lintels are borderline for large spans. Having done some more thinking, is it acceptable to use timber for a lintel? That...

Sorry for the slow reply, I've been away. I'm at about 80m ASL just north of Bristol and I got the snow loading from a contour map (can't remember the website) that shows 0.4kN/m. The weight of Redland 50 Double Roman came from the Redland website for min gauge (ie worst case)...

I had assumed that it came within permitted development - no higher than 4m and no bigger than 15% of house volume, or has the law moved on? Party wall stuff is a good point, although we have no problems with the neighbours and they are happy with what I am doing (and will probably copy it in...

Height is the issue. I want to get high enough at the front for a door frame, but higher at the back to increase the pitch. I'm already a block higher than next door's extension and don't want to go much higher. There's no loft space, and the walls are solid (single brick). My loading calcs...

Thanks for the quick reply. It's about 2.1m front to back. The back wall is being raised also but that's the easy bit as it's all block with no openings, and the roof will be replaced (see other conversation in 'roofing' forum). I calculated the total roof load (for the new roof inc thicker...

I need to replace the windows and door in an extension. It was constructed about 40 years ago and uses a single piece of 4x2 timber across a span of 3.5m. Above this are joists at approx 400mm spacing supporting a tiled roof at less than 15deg pitch. I want to install concrete lintels and...

Good point, I'll try fixing vertical battens. Mike

Do you mean like this? The internal space is habitable (not a loft space) so the insulation and ply is a good idea, but I can't guarantee getting good access for fixing vertical battens to the outside of the wall. I have secured the wall plate to the wall with 1m straps and the joists to...

There are two rooms in the extension and I'm tackling them one at a time. I've built up front and back walls along the first part of the extension and fitted wallplates and joists at 400mm spacing. I want to put sarking boards down, partly for insulation but also because the pitch is not as...

Excellent, many thanks for the quick responses. Cheers, Mike

I need to replace the roof on my extension, at the same time raise it slightly to get a full size door and frame in, and get a better slope (currently tiles over felt on a 15deg slope). The top of the roof forms an apex with a similar structure next door sharing a party wall. Although they have...

Our Victorian semi house has a single storey extension sharing a party wall. It's well past its best (still has the same woodwork as when built in the 60's) and when we bought it 8 years ago, we and our neighbours (their extension is worse state than ours!) envisaged replacing both structures...

Is there a standard height for the waste exit from a back-to-wall toilet pan? Reason for asking is we've got several brochures from different manufacturers, and whilst some give dimensions (typically 175-185mm from floor to centre of 102mm dia exit pipe) many don't. As I don't have the option...

That's the question I'm trying to answer! :) Mike