Perka: Pole (Wood only) Buildings

Return to Perka Library Pole (Wood only) Buildings Benefits 1. Trusses are closer together, usually 4’ to 6’ O.C. and very seldom 8’ or more. 2. Metal roof is screwed to wood purlins. Chances of leaking is almost nil. 3. Easier to put in windows and doors with wood girts than steel girts. 4. Can easily make decisions on windows and door openings after the roof is installed. 5. Wood is more acceptable as it reflects a comfort zone in building or framing as in a “home”. 6. Wood is a non conductor of heat/cold and is a good insulant and thermo break product. 7. Easier to find home builder type contractor vs. steel erectors for the building. Less costly per hour for labor and for lower rates on workman’s compensation insurance. Also trades to work with wood are more readily available. 8. Note: If steel was really that great then the home industry over the past 25 years would have captured more than the ¼ of 1 percent market share they have now. 9. Wood is warm and more comfortable. Disadvantages 1. The purlins are applied horizontally, not vertically, causing a wavy roof system. 2. The wave of the roof stretches the metal causing screws or nails to pull out. 3. Trusses being 4’, 6’ or 8’ O.C. makes for a good landing pad for the birds to perch themselves on and make a mess of the inside of the building. 4. With wood trusses, there are limitations to head room if and when needed. 5. Columns are not engineered causing not much security with high winds and snow. 6. Columns 6’ to 8’ O.C. there is no chance to enter in the side of the building with a 10 or 12’ door or wider. 7. Frame assembly and erection typically requires extensive bracing and/or tie downs to prevent collapse until purlins are installed and metal is on roof. 8. Under fire you can open the roof to rid the excess heat will help but usually entire building is lost. 9. Non-engineered columns can collapse due to heavy uplift wind, snow/ice loads or fire.