Log builders use the logs with severe spiral, they are just very careful about where they use them. I'm not an experienced log builder, but its not hard to find photos of log walls where a twisted log lifted those above it and created a gap. So to summarize, their builders have found using 1/2" rebar into a 5/8" hole pinned every 24" the logs will stay in place. "We built with englemann spruce from BC and we had some right and left twist logs. If you rebar it as tought, you won't have any problems." I have used a 6 ton chainblock (close to capacity) to encorage logs into the correct places, rebarred them and let go with the chainblock. Its a fact - not all logs are as straight as you would like them to be. "My Eucaliptus Saligna logs over here in South Africa are known for bending. Too much twist causes them to move around and can be a big problem." It's a different story with hand crafted logs which may only have a through rod every 4 to 6 ft and the hole for the rod is oversized by 1" or more.
I've known builders to pull their logs into alignment with a 5 ton come along and then pound in the rebar and there wasn't any movement after they were done. If you are shaping the logs and attaching them with 1/2" rebar every 24" there is very little concern about the logs moving and twisting after the structure is built. Mostly I believe this has to do with whether shaped logs will try to move and lift your structure after it is built. "The International Log Builders Association out of Canada talks about right hand and left hand twist in their standards.
If you avoid severe spiral grain it's not a problemįrom the Log Home Builder's Association forum, people who have been teaching log home building for over 30 years: I don't know how long a solar kiln will take to dry lumber, but generally log builders build green and let it dry. Look for log building standards on the ILB site. Is the difference more than an inch? If so, use that log only as a post or in short sections horizontally. Measure from the ends of this 30 inches, perpendicularly,to the crack. # Posted: 11 Mar 2014 14:51 - Edited by: bldginspĭraw a line on the log parallel to its axis, next to a drying crack. I'll be checking on how long it will take to kiln dry (solar) for an 8x8 beam. Ok I don't understand the left/right spiral thing could you explane better? also these will be pinned together every 2ft I do understand the twisting part just not how you figure the spiral ,I've done some checking at the log builders site but haven't found it yet. Other than that its best not to seal up green timbers behind sheetrock or other finishes which will trap the moisture. of Log Builders guidelines on use of logs.
The log cabin building trade is well familiar with this, see the Int. If the spiral is greater than 1 in 30 on left hand spiral logs, or greater than 1 in 20 on right hand spiral logs, the likelihood that they will twist while drying is high. Twisting could be a major issue, if the timbers have severe spiral grain. So any thoughts? by the way not worried about shrinkage as this has been worked out. Is there any problems using center cut 8x8 green D logs when building a small cabin? we may not have time to get these dried all the way be fore the building starts at most maybe 1 year of air drying and a month in a solar kiln. Small Cabin Forum / Cabin Construction / Using green logs Forums - Register/Sign Up - Reply - Search - Statistics.
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