![]() So strong that in a smallish structure it seems like the main concerns for the uprights will be making sure they are properly attached and braced to prevent lateral movement/wiggle, and well protected against decay/damage. I'm pretty sure I'm unqualified to interpret these! Buuut I think the main takeaway is, vertical columns/posts of wood are REALLY strong. Is 'Outdoor Structures' Time Life any good or is it only fences, pergolas and deck type things?Īccording to 'The Timber Framing Book', pine on end can support 600lbs per square inch, so a standard 4x4(3.5"x3.5" true dimensions) pine post, on end, can support 7350 pounds.Īnnoyingly, the book does not seem to have a table of vertical strengths of other woods.ġ) A 'capacity of wood column calculator', allowing selection of various parameters including a variety of species: Ģ) A PDF published by the American Wood Council with a LOT of information in it: ![]() roof sheathing is going to be from 1 1/2 psf up to 2 psf. per square foot (psf) up to 3 psf, depending on the type of roofing. roofing, which is going to be from 1 lbs. Can anyone point me in the right direction, please? To calculate the maximum span of roof joists you first add up the Dead Load (weight of joists, roofing material, etc.) to Live Load (weight of snow) to determine the Total Load. I am thinking some arrangement of posts and beams, but I can't find any usable info on dimensions thicknesses etc. It seems anything goes on top of what folks in the US call stick framing, but I would rather not have too many uprights to work around and at 7m longest measurement, I am going to need some sort of support in the middle, where I really want open space. So the actual roof is fairly straight forward, it's just 'how to support it' that's the problem. On the plus side, I can find no end of tables with detailed info on rafter spacing, span, loading etc. Sadly there is no source of round timber within sensible distance, so it's got to be standard flat roof construction, with rafters and EDPM. Regs also make building above 2.5 m high, prohibitively expensive so a proper timber frame is not really needed. It will only be small by US standards, 30m2 max due to local regs (UK). I am trying to figure out what size timbers I need for it's basic frame. but I digress, the current decision to be made is about supporting the roof:. ![]() I have made a 'freestyle' strawbale shed, and it's ease of construction makes strawbale very tempting, but I would like to make use of passive solar heating and I gather that solid cob is best for that, but then again, not much sun is going to hit the back wall if any. Sadly, at this stage, there isn't anything particularly permaculture about the workshop I am planning, except that I intend it to last a very long time! Once the roof is up, I can choose/experiment with solid cob, wattle and daub and rendered straw bales. ![]()
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