Wood Arch Greenhouses.....
I designed a wood arch truss for building a 16 Ft wide greenhouse. Today I built the first truss to see if the design and wood would work.
After reading some time about wood species I was still baffled as what was the best for a greenhouse and would bend well for an 8ft radius.
Why I have no idea I found myself using Cypress and paid $3.80 a liner foot for 2 - 2x12 clear rough sawn. This is the first time I have every used Cypress and it was not that hard to use however I had to soak them in the pool overnight to get them to bend enough to build the truss.
I still broke a few bending them however I think it was the pieces with the grain going off the side of the board and not straight as the others were.
I have enclosed a picture of the first truss. I am hoping others can tell me a better wood species to use that cost way less than Cypress and may bend well cold without having to soak them or build a steam box.
The radius is 8ft with a the top of the arch. The rips are 2 ply 3/4 x 2" with a 2x4 block and then 2 ply's more of 3/4 x 2".....
I have had no success in contacting the wood dealers about the properties of the wood species they use for bending.
I was going to try Western Red Cedar next but have heard Hemlock may work. I have no problem soaking them in water a day before like I did with the Cypress however it seemed like the Cypress was at it's max for cold bending (wet) at the 8 ft radius inward to the last ply that is about an 7'-6 1/4" radius.
Does anyone have any suggestions as to the best wood for constructing this type truss and something way cheaper than Cypress.