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Hello. When I look at construction details for warm flat roofs I see the VCL is placed above the joists. However for a warm pitched roof the VCL is placed below the rafters. For example see the attached image from...

Thanks all - that’s useful feedback and a good set of answers to the question :)

Our design company is doing building regs full plans drawings. Once approved by BC how closely to these plans does the builder need to stick? Can materials or the build be altered at build time (presumably with approval of the approved inspector) - or is this something that the inspectors would...

Thanks for the answers! @Murdochcat this is a forward thinking question. The party wall process hasn’t yet started. I was surprised I couldn’t find the answer to this question anywhere as I’m sure this situation must happen a lot.

This would be the party wall process for excavations within 3m of the neighbours foundations - and to a greater depth than their foundations. I understand a lot of people will kick the party wall process off simultaneous to the planning process to avoid delaying the build later on. But I’m...

Hello, if the party wall process has been started before planning permission has been granted, and then planning permission is refused, is there an easy mechanism to end the party wall process? The party wall act doesn’t seem to have much on cancellation. Then if following refusal a new...

@noseall thanks for the info and photos :) Is it a warm roof on the pitched part as well? I see the insulation on the flat part is below the level of the rafters. Did you then get insulation boards over the top of those rafters? Thanks!

Hello, We’re figuring out the design for our crown roof - something like the attached image, where we have a flat part on the top (with appropriate fall to stop water pooling), and then it would be pitched on three sides. Would this kind of roof be better as a cold roof or warm roof? I...

Hi, Our extension width and length is not divisible by an exact number of bricks (taking into account a standard mortar width of 10mm). This is for an extension with planning permission - not permitted development. What might be the best approach? - create the walls slightly under the planned...

Hello, I’m trying to design a crown roof for our rear extension with two of the sides at 270cm (to reduce light impact for the neighbour) and 300cm at the other two side (to allow us to have higher kitchen units). This creates the problem of what to do at the transition between the heights. I’m...

Thank you so much. That is really helpful (y)

Hello, we are planning a rear extension which will add an new UFH system, one extra radiator, and an extra towel rail. Currently we have a 10 year old Worcester Bosch 25si combi boiler which is doing alright. It has recently been serviced and the gas engineer said it is looking good...

Thanks! These are thick walls then!

With the 2023 building regulations changes it looks like the external wall width (from exterior brick to finished plastered internal wall) for a new extension would be: 102.5mm - exterior bricks 150mm - cavity for standard insulation (unless using some higher performance / more expensive...

Thank you so much for the feedback here :) I've had a go feeding most of the suggestions into an updated diagram. - I've rotated the manhole and checked / modified angles to get 45 degrees where possible. - I've added in a shower to the downstairs toilet to make it more complicated! For the...

Hello, hoping I can get some feedback on a drainage layout I'm trying to do for our extension. This is an update on an earlier design I posted - I've now removed the internal manhole and it is located outside instead :) We have a private combined drainage system that heads over to our...

Thanks! Curious if there is any maximum size for a sensible cold/warm roof? Just trying to work out if such a roof can easily slot between the mess of drainage pipes on the back of our house!

Hi, I’m having difficulty finding an answer to what seems a simple question. What is a typical depth for a warm vs cold roof in a rear extension? i.e the measurement from the underside of the ceiling to the top of the roof. Thank you!

On one of the above comments it says "Relocate the existing SVP - either completely or by running it laterally at higher level". For the "running it laterally at a higher level" option, would the following be acceptable - see diagram? There is now a lateral bend below the 1st floor bathroom -...

On the right side I think the gap between the extension and boundary will only be 40-50cm, so not enough room for an IC? But perhaps big enough for a rodding eye?