ETC

The BCO should tell the builder to do it right. It’s his job to make sure the build satisfies all regulations including those relating to thermal efficiency.

You should read the wording of a Completion Certificate very carefully. There’s a big caveat in the text.

The BCO will not “sign” anything off and should not tell you how to design or build your roof - your BCO is an inspector, not a designer or a clerk of works. The onus is on the applicant to comply with the Regulations and to ensure the construction complies with all relevant standards including the BBA Certificate for the material. The BBA certificate needs to be complied with otherwise the manufacturer will not accept any liability for the materials use if used differently from its intended use. The BCO should never change construction methods detailed on a BBA Certificate.

It’s not as simple as that. Check the caveats on the BBA Certificate. Not up to the BCO - they will take their steer from the BBA Certificate and BS.

Your rafters must be 200mm deep to allow a 50mm ventilation void behind the 150mm thick insulation along with 25mm over-fascia vents. The rest of the build-up including the thicknesses of all insulates should correspond with your SAP Calculation. Double check the location of the VCL - with Kingspan - I’m no expert but I would normally expect it to be below all insulation rather than between insulation boards but this can be checked with your designer and Kingspan. Don’t be afraid to ask your BCO or any materials supplier for help with the correct technical advice. You may even wish to send the photographs to Kingspan to see what they would say. If this was on any of the sites I visit I would tell them to do it properly.

Too many gaps. The boards should be tight fitting. It’s not difficult - show this to your BCO and get BC to tell him to fit them properly if you’d rather not tell him yourself. Foam is only a sticking plaster and won’t have the same thermal resistance as Kingspan. I presume you have a ventilated gap above the insulation and that you will be installing insulation or insulated plasterboard across the face of the rafters?

I think having the cloakroom in the utility is actually a good idea - it gets the coats out of the way. Just wondering if you need a separate cupboard or just a few hooks on the wall. In hindsight the only reservation I have about the layout of the master bedroom is that if you want a tv in the room you’ll need a bed with a tv at the end rather than a wall mounted tv. Other than possibly moving the master bedroom door back into the corridor and thinking if the window in the bathroom might be difficult to open if the bath is there I think the layout is grand.

And another.

A bit of a sketch.

Just add in extra laths where you need then. It’s not rocket science.

You sound like my boss. He’s forever telling us to look up the BS. Unless you are? You’re not though are you??

That’s a lot of coats….

https://nhbc-standards.co.uk/7-roofs/7-2-pitched-roofs/7-2-20-weathering-details/

Split the contract and tender it in two sections - one for the demolition and another for the rebuild. Make sure you have all your i’s dotted and t’s crossed and that you have a tight specification and schedule of works and see what the costs are.

Very Charles Rennie Macintosh…..

Grand….didn’t think the stairs were wide enough to need two handrails under BC but that makes sense. Thank you.

Why two handrails?

You’ll still need the DPM under the insulated screed at ground floor level. Not sure why you’d use the insulated screed at first floor level though?

I’m not in Scotland but I think @ProDave has hit the nail on the head in relation to the registration scheme and BCO inspections. Where I am located we don’t have a registration scheme requirement for design or construction of construction projects to be inspected by BC. In my experience a BCO will have a certain number of basic - statutory if you will - inspections to carry out and the rest will be spot or interim inspections to look at the works in progress - mostly, but not always at the request of the contractor or applicant. The first inspection will be to look at the ground condition for foundations, then once the sub-floor block work is built an inspection to look at the hardcore/fill. Drainage (layout, cover and falls) will be inspected, DPCs, DPM, insulation, the roof structure and the cavity walls will also be inspected. This is a very basic run-through but essentially everything that can be covered over will be inspected. The drains, SAA, HAA and CO alarms and extract fans will also be tested on completion. Documents at completion as @ProDave suggests will include EPC, SAP and all commissioning certificates. Interesting to see what you guys need there compared to what we need here. Thanks for reading.

I don’t think it will act as a sub-floor. It’s more of a poured insulation/screed and does remove the need to cut the PIR insulation around pipes. However I do believe that you will need quite a bit more of the insulated screed than you would PIR so check with your SAP assessor for the thickness required. You will also need to think about where your DPM should be located and more than likely you will need a VCL and perimeter insulation before you place the final screed. I have experienced contractors laying the heating pipework above the sub-floor slab, covering it in the DPM and then pouring just enough insulated screed to cover the pipework leaving a flat surface to lay PIR insulation on. Then it’s just laying the VCL and placing the perimeter insulation before placing the final screed. In any case speak to your BCO and SAP assessor before you go down this route so that everyone is singing off the same hymn sheet.