I Joist Flat Roof. Ad Vacancy is at a general roofing contractors based in north London. Flat Roofs with a slight slope can be achieved using Trus Joist TJI joists and solid section products.
Depth to width ratio should not be greater than 6. Since the main part of the house is 40 long the I-joists. Not to strengthen a butt joint.
Engineered I-joists are predominantly used for floors but in some instances can also be used to create flat roofs for both residential and commercial buildings.
If you have a low-sloped roof or flat roof of less than 2 in 12 these evenly spaced planks will be called roofing joists. Experienced Roofers Needed Looking to Start Immediately. Im trying to balance cost vs. Joist is a term used in construction for load bearing planks that run horizontally or nearly to horizontally to ground.