Recently replaced some rotting exterior window sills and underneath boxes. Decided to use wood (pre-primed chinese/japanese fir)for the sills, ripped my bevels on it and ripped the drip stop dado, attached it to the window from underneath and then got out my clam clamps and Titebond III, glued and clamped up the returns. (sill was 6″ wide, 3/4″thick, windows were 12′ long, 12″ returns) took the clamps off at the end of the day… came back the next day and three out of four corners had cracked. I re-glued with gorilla glue and ran some trim screws to reinforce. But I could not believe this had happened. I am thinking it might have been moisture? The pre-primed wood was stored indoors, and the weather was 25 degrees C… with no rain.
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Somebody? Anybody?
OK, tell us more about the material you used.Any possibility you can post pis?
Edited 6/29/2009 7:35 pm by kenhill3
I did not take any pics however it was a pre-primed fascia 1x8 from brenlo. I think the rep said it was chinese fir which had rot resistant properties. Could it have cracked from being exposed to the sun and because the mitre was quite long? (7-8''??)
I have glued up poplar stock 3"1/2 wide and could not break the corners without a hammer as a test.
Seems I've always had problems with wood products from China, namely 11-ply Birch that was just one big sheet of blows. TPOS. I am not familiar with the product you referenced.That IS a long miter to not have splines or biscuits. Sun/heat sounds possible.Perhaps material was TOO dry?Lots of folks here know way more than me, so hoping they will help here................