a question for door and window makers

[jeffinfrance]

hi,

"U" values!

does anyone know of a table of these values for different types of wood. cant seem to find anything type specific and ranges of "U" for "wood" seem to vary wildly.

over here, for a client to qualify for their 50% off tax credit, a window or door has to have an overall value of less than or equal to 1.6.

i can get figures for the glass no probs, but i'm after a figure for 60mm oak.

thanks, and all the best,

jeff

 

[ByronBlack]

This any use to you?

http://www.combustionresearch.com/Infra ... value.html

 

[JMcK]

Or this?

http://planeteconom.free.fr/index.php/301-economie.html

Oak is listed.

 

[chipchaser]

Hi Jeff,

Would table 3-11 of this USDA publication help?

http://www.fs.fed.us/ccrc/topics/urban- ... 20wood.pdf

European Oak isn’t there but I would guess that the value for a species of similar density might be substituted. I’ve not tested that assumption so you will have to make a few trial comparisons of similar density timbers in the table to test it yourself.

This table shows k of Oak (origin unspecified) near the bottom as 0.17 W/mK:

http://www.engineeringtoolbox.com/therm ... d_429.html

I bet any figures are averages as timber density varies within the type anyway

Graham

 

[jeffinfrance]

thanks guys,

they're a great help.

that last one is a mine of information!

all the best,

jeff