Nestor

@Cpd Yes I am doing the roof myself, in fact the whole build so far. The Tata does work well, 4.2m sheets just doable but fitting the ridge on the first roof was a challenge as the Sikaflex sealant goes everywhere you don't want it. The eaves and verge details work well. The extended cut is the top pan overlaying a shorter piece underneath which fits next to and then extends up, under and along the window flashing. Cutting the sheets with metal blade circular saw then up stands using folding tools. The Velux apron was not sticking very well possibly due to the intense heat at the moment so will revisit with sealant and possible fixings. Where possible I trimmed the aprons to fit tight underneath the seams. Very impressed with Velux, as long as you follow the instructions. My brother helped me lift the large windows in, 69Kg. 300sq m + to fit, quite the expert now. First roof below.

@Cpd That is a really great job. Did you design the apertures to fit neatly within the corrugations and did you use the EDW flashing kit? I am fitting 7 Velux within a Tata Steel roof, quite challenging and takes a few windows to find the right solution but happy with the end result. It should not leak!

I think you have to get down to the slab only as it will not be classed as a new build if existing walls, roof retained. My brother partially demolished a bungalow then was informed he could not reclaim the vat so demolished the rest but kept the existing slab. He just got a 22k refund.

Does this temperature meet the legionella issue as you have disabled the immersion. Do you know how an ASHP can be used for cooling UFH, I am looking at the new, (quieter) Mitsubishi Ecodan PUHZ-W85VAA. Thanks.

Hi, looking great. Can you confirm that price of £7600.00 for TF is correct, down south you would struggle to have a large garage built for that. Enjoy the build.

Our windows recently fitted. They fixed Compriband to the frame prior to install and then added foam after from the inside. Works well.

Thanks @A_L and @Alexphd1. Correct on the internal floor area. Have a lot of insulation, 3G windows and doors and MVHR. Its airtight. Just want to run a system which is efficient for a family of 4 for 90% of the time. Can someone tell me what a scroll vs inverter ashp is?

The heat loss is 11248 for heating and 4921 for HW. Total 16169kWh. Both suppliers had the SAP test. Over specification? @ragg987 Good point.

I have a couple of quotes to consider for our DHW / Heating solution. UFH and ST for both. 1. NIBE F2040-12 with 100 litre buffer and 500L UVC 2. Mitsubishi Ecodan W85 with 300L UVC, no buffer. Have read @Stones excellent blog about Ecodan. Can anyone share any other experiences of the above topic, Thanks all.

Great job, I did this at my Dad's home, flint stone walls. With the right discs its not difficult. Why the professionals did not bother just leaves you with inconvenience , no recommendation and continues the complaints about trades people.

Sorry for confusion. I used Exeter CCF. In the end they could only supply 2440x1220 at £8.40 a sheet. I have 600 centres so had to trim sheets to fit. 2400x1200 seemed very difficult to obtain and at a premium. You could try https://www.southern-timber.co.uk/ They have been very helpful.

OSB3 11mm 2400mm x 1200mm . £8.40 + vat a sheet. this was end of January. Includes delivery. https://www.ccfltd.co.uk/

No, I would always use a roof ladder for access. Less contact with the surface the better.

@Temp @ProDave Thanks for your replies. I have spoken to my BC and has said cavity is not necessary as its a warm roof. I would like a cavity so 25mm is fine, no counter battens needed. Tata want a solid deck of OSB, provide you with 40mm nails which go straight through the OSB and puncture breather membrane which does not work for me.

Kastrup and Internorm windows and doors now fitted. Took about 12 weeks from initial deposit. Fitting and manufacture issues still not resolved 4 weeks later. Balance of payment outstanding until all issues sorted.

Ok, I have a warm roof, Pavatherm above the rafters. About to fit Tata Steel metal roof but not on OSB sheet but batten fixed vertically at intervals to support the pan. Do I have to have a 50mm ventilation cavity as its on batten not OSB which would not need a cavity for a warm roof. Is it necessary? Thanks all,

I applaud your effort looking at alternative options, FYI I purchased BPC MVHR for 2.6K + vat. Includes 6 extract and 7 supply. 285 sqm building. Self installation. I have spent £400 on airtight tape!!

Just want to add what a great job you have achieved doing the insulated foundations yourself with some ground workers. All for DIY.

Only mentioned because I bought 70 sheets in December as the price went up 30% in 6 months.....

Just checking the amount of celotex, they quoted for 101 sqm yet your ground floor is 145 sqm.

4 days! A year later and I have nearly finished the airtight OSB layer, next electrics and plumbing.

We did revise the drawing I sent you, the 150mm Celotex butts up against the DPM / blockwork. Does that make sense?

This is our floor, wall and roof build up. Hand drawn. Airtight layer (VCL) inside. DPM over blockwork under DPC. I did put sealant in the bolt holes. Floor, Wall, Roof Build up Jan 2018..pdf

I just bolted the soleplate to the blockwork through the dpc, then frame on top. No mortar.

I thought of a Telehandler, 3CX or similar for off loading and other tasks but on my build I have used a Telehandler once for roof materials , local farmer. Arctic came with a Moffat to deliver insulation, all timber deliveries have been off loaded with Hi-ab. Steels went up with a Genie lift and Glulam ridge lifted in place with digger and home made jib attached to the bucket. So far the cost has been under £250.00. I still want one though........