ADLIan

Scot Regs pretty much reflect English Regs. 100mm mineral wool between joists.

Building Regs require 'mineral wool' (this is glass or stone wool) min 10 kg/m3, 25mm (min) in partitions and 100mm (min) in intermediate floors. Density in walls is normally higher to give product mechanical strength for vertical use. Do not go too dense (more than approx 25-30 kg/m3?) as it's a waste of money. Warmcell is not included as generic BR solution so you would need indepependent test data for use in wall and floor of the same construction.

Knauf Earthwool is glasswool! +1 Declan52

Remember this includes exsiitng builds too. The EPC band D requirement ensures existing housing has reasonable(?) levels of insulation/energy conservation measures before installing the PV. New build will normally be Band B or better.

+1 Just had a look at the EST website section on FITS. Application date & EPC determines the rate of FIT. Lower rate from 10 May

In new build the EPC cannot be produced until the house is 'physically complete' - this includes commisioning of services, air pressure test (if done), confirmation of the 'as built' specfication, use of ACDs etc. So the EPC will ALWAYS be dated after all of the above! I normally receive a copy of the MCS cert for the PV (if available) and provided I have the above will produce the EPC. This has never been a problem in the past in then applying for FIT Suggest you mention this to your supply co.

Hi ProDave Sorry but I do not have the docs refered to. From memory a lot was common sense! No/minimal hot works, no smoking site, site security against arson, sensible/separate storage of combustible materials (polystyrene or similar insulation), ongoing checks and inspections to look for potential problem areas, emergency escape routes/plan, site fire safety plan keep a tidy site. Sorry can only manage 8 of the 16! A quick google however gives this - hope the link works. http://regions.aps.org.uk/visageimages/Documents/PDFs/regional_cpd/Northern_England/16_steps_to_timber_frame_fire_safety.pdf Ian

All Certainly not a trivial or petty issue. Accidental fires (arson, bad practice or pure accident) in part complete TF buildings have been a problem for some time and recognised by TRADA and UKTFA (now Structural Timber Association, STA). All brought to a head in 2006 with a fire in a built-up area of N London involving a part complete 6 storey TF building. In 2008, the UKTFA, in consultation with fire brigade and HSE released the '16 Step to Fire Safety' book which in turn was adopted as official guidance by the HSE. Aimed at larger schemes rather than single dwellings there is the guide, the 'SiteSafe' practices guidance and a registration scheme for projects over 2500m2 total floor area. Unfortunately all this guidance looks to be available to UKTFA/STA members only (see STA website). I'm not a member but was involved in some of the fire testing for different types of TF panel. ian

Glass wool available in high density rolls (0.035/0.032 W/mK) and slabs for TF walls both at 570mm width. Ian

If it's conversion then simple elemental U-values, heating efficiencies etc in Part L1B. No need for DER/TER or DFEE/TFEE or pressure testing but SAP calc is required to generate the EPC on completion. Must be done by on construction energy assessor using full SAP (as its a Reg requirement) rather than RDSAP. Ian

+1 JSH & Declan52 200mm dense mineral wool (0.035 W/mK) underdrawn with 25mm PUR should give approx U=0.16 W/m2K (rafters at 600mm c/c). Use 30mm PUR if rafters at 400mm c/c. Ian

Thansk JSH. A bit of history - the original Actis tests were done on 2 identical 'chalets', from memory in Limoges, France. This info may still be available on the internet somewhere. One chalet had 200mm mineral wool quilt in the roof the other Actis multi foil but not much other data on the construction. Actis measured 'heat loss' from the chalets and came to the conclusion that 200mm quilt = 30mm(?) Actis. There was never enough data to check if they were actually measuring heat loss through the roof alone or via a myriad other routes. Complaints to the ASA only resulted in a change of product name, Actis 8, 9, 10......It seems that only when BRE did their work, BR 443 was updated and other manufacturers of multi foil products gained certification using accepted test methods that Actis back tracked. They still use a mixture of in-situ and accpeted testing - not sure how they explain the huge discrepancy. As you say - why trust them now! Hence my warning about thir claimed U-values!

NSS - OK, just looked to be at 400mm c/c looking at 150mm actis between. Check Actis U-vals against their 'certified' thermal values very carefully.

I was involved for many (too many!) years with the ongoing Actis saga and their wild & spurious claims. They now declare thermal performance in accordance with both accepted Standards (EN 12667 and EN 16012) and in-situ/comparative testing (the latter not to be used for U-vals under the Regs). Above roof may only achieve U=0.17 with rafters at 400mm(?) c/c and ventilated airspace above the Actis product and Actis VC product directly under the rafter. Ian