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I’m not a plumber firstly, but here goes. I’m doing a loft conversion, the new bathroom toilet is directly above the existing downstairs toilet. The plastic soil pipe in the downstairs concrete floor comes up about 9 inches from the wall. (I don’t want to take the soil pipe through an outside...

I am building a level threshold for my bifold on my extension, having an air brick Telescopic vent just below dpc, would clash with the insulation on my block and beam floor. My architect has detail a cavity tray above the air brick, even though there’s a bifold directly above it? Is this required?

My first question is, my architect has not included a level threshold detail for my bifold doors. Can I differ from the drawing without having it approved? Can my BCI just approve a method? can someone explain or show me the detail for a level threshold? (Beam and block floor) I would’ve...

Hi I’m about to commence on a rear extension. The block and beam layout has to be drawn up and sizes spec’d by the beam supplier, and then sent through to our BCO. my question is, where the beams key into the existing wall, can they simply rest on the outer brick skin? (On a DPC) or do they...

Hi guys/gals I’ve just had a plans appraisal back from our independent buildings inspector regarding a rear extension and loft conversion. He’s asked my architect to explain how the existing gable end wall will be insulated to ensure a u-value of 0.28W/m2k. Obviously the most practical way of...

I’m doing a rear extension on my bungalow, the floor is going to be block and beam. My question is... where the beams key into the existing cavity wall, do they have to knock through so that they sit on the inner load bearing skin? Or can they rest on the outer skin? any advice would be...

Hi I’m building a rear extension on my 2 bed bungalow. The existing foundation is a strip foundation, and it’s a fair way below ground level, I’d say 900mm. Because the ground is clay, we have a spec of a 600mm x 1000mm trench fill foundation. My question is, can this new foundation rise above...

I’m building a rear extension on my bungalow. The block and beam floor has been designed so that the beams run parallel with the rear facing wall. So i understand that usually if they were running perpendicular, the beams would key into the existing wall and be supported by the load bearing...

Is a cavity required below a bifold door? My architect has sent me drawings and it’s showing a cavity tray with weep holes below the bifold, I’m presuming it may be there to send any water that goes through the frame/sill to the outside (he’s currently away) here’s the part of the drawing...

Hi I have a single storey extension going in with a 4m long bifold to the garden, it is likely that due to this span we would be installing this steel with welded plate as you’ve shown in your detail drawing. My question is: Where this steel is supported at either side of the bifold, will the...

I’m building a rear extension on my end of terrace bungalow, my Architect has specified a 600mm x 1000mm concrete foundation. At the adjoining boundary to next door we have a concrete post fence, the 150mm “toe” of foundation on that side of the 300mm cavity wall will need to go slightly past...

So I’m doing a loft conversion and extension on my 2 bed bungalow, the building regs notes asks for “fire resistant cavity barriers to be installed at tops of wall and gable end walls” anyone know what these look like? And can provide me with a link to the ones I need? It’s a full fill cavity...

I’m building a rear extension on my end of terrace bungalow, my Architect has specified a 600mm x 1000mm concrete foundation. At the adjoining boundary to next door we have a concrete post fence, the 150mm of foundation on that side of the 300mm cavity wall will need to go slightly past the...

Hi guys/gals, I’ve recently had my building regs drawings through from my architect for a loft conversion where the truss roof is coming down and new roof put up, it states “restraint strapping - ceiling joists and rafters to be strapped to walls and gable walls, straps built into cavity across...