As design and as built SAPS

[iMCaan]

I hope this thread is in the correct section.

 

Hi

 

The company that is doing our house as built SAPs as asked me to sign and return Part L1A 2013 Specification to sign off the dwelling, see attached. My concern is we didn't use as much insulation as stated on the form for walls (stated 100mm but used 50mm PIR) and floor (stated 150mm but used 100mm PIR for UFH). Therefore, the house won't achieve the stated u-values.
Any suggestions as to what to do? We are ready to move in.

Should I be concerned?

Oh boy this feels bad but I must ask, should I sign it as stated should I amended it then sign it? What are the consequences?

 

Thanks

 

[JohnMo]

Email them back and state what you did, they will update the U values etc.

 

Then if you get a fail, get ready to install solar PV to make up the difference.

[Mr Punter]

If you amend it the house will fail and you will need to spend ££££ on PV to get a pass.  That said, solar PV is quite useful.  It could still fail on fabric efficiency.

[iMCaan]

I was hoping you would just say just sign the form without amendments. How would they know what insulation you have used? 

arggggh I don't have the funds for the solar  After 5 years, we just want to move in. 

[JohnMo]

2 minutes ago, iMCaan said:

I was hoping you would just say just sign the form without amendments. How would they know what insulation you have used? 

arggggh I don't have the funds for the solar  After 5 years, we just want to move in. 

Then don't ask questions you don't want a truthful answer too - which isn't what you want hear!🫣

[iMCaan]

It's just frustration.

I asked the questions to hear the truth.

 

Besides solar, how long would you have to fit the solar?

Can they enforce adding insulated plasterboard, which would mean a lot of work?

 

Edited yesterday at 12:39 by iMCaan

[saveasteading]

But have yph changed from 100 dritgerm to 50 pir? Much the same performance?

[iMCaan]

Yeh we used 50mm pir insulation in walls. The cavity walls were 300mm with in total (100mm blocks, 50mm PIR insulation, 50mm cavity and 100mm stone).

100mm PIR insulation on ground floor for UFH.

25mm PIR insulation for first floor UFH.

200mm earthwool between joists.

400mm earthwool above joists.

150mm PIR insulation for slopped roof.

 

[saveasteading]

That's not bad insulation. the first floor insulation is irrelevant too the rating.

 

600mm earthwool to roof? really? 

and 150mm PIR to the rest of the roof.

 

I dont have figures to hand but that might pass.

 

[Mr Punter]

1 hour ago, iMCaan said:

I was hoping you would just say just sign the form without amendments. How would they know what insulation you have used?

 

OK sign the form without amendments.  What you have in there is broadly the same as was specified.  Do you need to provide photos?

[iMCaan]

For clarity...We have two attic rooms. In the eaves (unusable space), it's 200mm earthwool in joists. The vertical and slopped wall of the attic rooms are 150mm PIR boards. There's some unusable space on top of the attic room ceiling and that has 400mm earthwool.

 

Within all cavity walls, it's EcoTherm 50mm PIR board insulation.

[iMCaan]

No, there's no mention of the photos in the email or on the form.

[ADLIan]

The SAP assessor will rerun the calculation with the revised insulation details. Hopefully all will be OK if some flexibility built into the design otherwise they should advise on options to get a pass (improved air test number?).

I don't think photo evidence was required under the old, 2013, version of Appr Doc L.

[iMCaan]

Thanks guys, let's see how heavy the punch would be. 

[SteamyTea]

Out of interest, who decided to change the specification, and for what reasons.

[iMCaan]

I don't think anyone intentionally decided to change the specification. Let's say it was my inexperience. I would have stuffed the house with insulation had I known what the SAPs were for.  I think we mainly followed the architect drawings instead, which stated the insulation required. I still added more insulation then what was stated on architect's drawings. I remember tradesmen saying why so much insulation. Luckily, adding more insulation as got the house spec. closer to the SAPs spec (I think).