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There's a installation video on the bathstore website

I agree, although it did throw our building control officer into a bit of a wobble, as he'd never seen one over 100 and assumed that 100 was as high as you could get.

I recently completed a 6m by 5m extension to an end of terrace house, I put in 100mm celotex in the old and new sections floors, front room of the old house with 50mm pir boards, only one side wall of about 7m is still uninsulated original brick. result? Disappointed. I did not live in the house before the build so can only compare it to the newbuild SAP B flat I moved from. That flat stays warm until January at the very least while I am already using heating in the house in September. Still feels draughty. All new double glaze sash windows, 2 bedrooms out of 4 fully insulated internally but not warm in September!! so don't go crazy on the extension, it will make wry little difference due to the rear of the house I used full fill mineral wool for the cavity as I did not trust the builders to use celotex without gaps.

When I emailed the EPC and air test chit to the BCO, this comment was a part of his reply: Later I had an email from the council energy policy officer, asking if he could come around and have a look, as the BCO had emailed him about this odd house in Wiltshire with a silly EPC rating....................

It works a treat! Not great looking but I'll improve that and paint the pipe green. All drinking etc water is still from bottles but wonderful to rinse dirty plates under the taps...oh how easily pleased I am???

In reality it is over 100 "who cares". SAP is quite arbitrary and favors IMHO efficient gas heating in mediocre insulated houses, and puts a high weighting on renewable at the expense of efficiency.

Page 11 of the ATTMA (The Air Tightness and Testing Measurement Measurement Association) Air Testing Standards for residential dwellings September 2016. https://www.attma.org/wp-content/uploads/2016/09/ATTMA-TSL1-Issue-3-Rev-0-2016.09.09.pdf

Same rule as the for the roof or chamber straps cover three joists or trusses I think with the wallplate BC don't like to see a tiny piece on the end As long as your smallest piece is 1300 or more you'll be fine