Need a book? Engineering books recommendations...
Re: Re: WOOD - Engineered Lumber vs. Sawn Lumber[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Re: WOOD - Engineered Lumber vs. Sawn Lumber
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 09 Sep 1997 15:14:11 GMT
- Cc: seaoc(--nospam--at)seaoc.org
seaoc(--nospam--at)seaoc.org,Internet writes: One reason not to mix sawn lumber sizes with engineered wood sizes is to avoid differential shrinkage of sawn lumber vs. dry engineered wood produ cts. Since the latter are already at or near the end use moisture condit ions when manufactured, they could wind up overloaded if end members (rim boards) are regular sawn lumber which can shrink from as manufactured to in-service depths. Likewise, if joists or blocking of both types are mixed in a floor or roof, high or low spots can be created if the sawn lumber dries and shrinks to lesser depth than the engineered wood compone nt. To avoid such problems, most producers "force" the specifier into using engineered wood for all framing components, to avoid callbacks to repair uneven floors, roofs, buckled webs on I-joists, floor squeaks, etc You make a good point, each condition must be evaluated for its appropriate use. But I don't think you can make a blanket statement not to mix engr. lumber with sawn lumber. There are instances when drying shrinkage may not make a difference. Specifically I would use them for heavily loaded beams, like the garage door header. Depending on how it is detailed, the differential in shrinkage would not make any difference to the building construction. If the wall studs shrink, the beam drops with them. If one were to mix TJI' floor joists with sawn lumber floor joists, then I could see problems develop. __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
- Prev by Subject: RE: WOOD - Engineered Lumber vs. Sawn Lumber
- Next by Subject: Re: Re: WOOD - Engineered Lumber vs. Sawn Lumber
- Previous by thread: RE: WOOD - Engineered Lumber vs. Sawn Lumber
- Next by thread: Re: Re: WOOD - Engineered Lumber vs. Sawn Lumber