Calculating U-Values

The Mighty Quinn

Does anybody know of any really good resource, paid or otherwise, to assist with u-value calculations?

I know the process, and developed an excel file, but I always struggle with materials to find resistance values or conductivity values and that.

If somebody can recommend a detailed (clearly written!) book, or software it would be fantastic, I need to get better at it.

Biker1

The BRE u-value calculator is a must have. I paid £75 ten years ago for mine. Comes with common materials and thermal conductivity values and you can add as many more as you wish.

Metric Tensor

I second the BRE U-Value calculator. Purchased it a few years ago and should have gotten it many years before that.

It has a library with it that is sufficient for most needs but not super massive. However you can add materials to it at will.

The Mighty Quinn

https://www.brebookshop.com/details.jsp?id=139470

£60.00 now, is this the one?

Metric Tensor

No screenshots so I can't be sure but it's from BRE so I assume they only have one calculator!

The Mighty Quinn

Purchased it.

Seems like it'll do just fine, limited enough in materials it seems but I can manually add as required, can take resistance values from either product literature for the likes of insulation, or from prescribed values in TGD L appendix table as required.

Metric Tensor

Make sure to use the certified values from Agrement Certs and the like rather than the sales brochure. Just to be safe!

The Mighty Quinn

This is it for anybody interested.

Metric Tensor

Yes - that's the one I have!