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Oct 12, 2023Liked by Lloyd Alter

30 Years ago I was mucking about in a barn generally puzzled by a straw bale assembly being tested when I got a visit from Robert Platz Scanada consulting and he had brought a senior gentleman up from CMHC. CMHC had provided us the funding and everyone was happy, except me. This was all turning out to be much harder than I anticipated. The visitor engaged me with compliments and small talk and it was much like many other PR encounters until the conversation switched to

CLT‘s, an industry which he had helped create. It turns out that making CLT is very very wasteful and he thought that the work we were doing with waste fibres was a potentially good solution to their problems.

I thought about it for about three seconds and flatly refused. Bob was stunned. By all accounts that was about the most stupid professional decision I have ever made.

Except it wasn’t. Carbon is more than just wood and a resource that we can do whatever we want with. For the record It’s not about CLT or even straw bales...it’s about forestry on steroids where ancient 1000 years old forests got destroyed IN ONE HUMAN LIFETIME ! We are not the only special ones to consider and as far as anyone knows, our planet is our only known home and it is a mosaic of life beyond our comprehension. Yea we can, but if wisdom is a good guide then maybe...

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mass timber AND I joists? Either, including studs, could hold up the house.

- is the CLT being used for its interior finish effects (beware fashion trends)

- is the wood in the CLT of too poor quality to use as double stud wall , truss wall. 2x4 advanced framing all of which is ample strong enough for modular or panelized construction.

- could the CLT be made from wood more flawed than is usable as studs

- speak more about the economics of selective logging. the Ministry of Forests seems intent on industrial logging to: allow current loggers to pay off their feller-butchers, feed mega mills, the highway standard logging access roads, burning of fibre left behind etc.

- beware the arguments for expansion of logging. How will non industrial logging be

- the CLT and other finishes, insulation etc. would need to be reconstructible and modularized for reuse

I do support the exploration of lower grade, lighter CLT for, as you have often proposed, for select structural applications.

Peter T

Loyd, have you become too enthusiastic?

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Another interesting article. One questions I've had about CLT is how can it be recycled? From what I know, the glues make it difficult and there aren't any clear answers from the industry. Are you aware of any solutions out there?

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