#Drip guard verses insulation in pole barn roofs professional
I’d appreciate your professional opinion on how best to ‘wrap’ my building and also ‘future proof’ it in case I happen to win the lottery and can afford to fully insulate it someday. Again, as time and $$ allows I’d like to add bat insulation and maybe OSB half way up the walls.
For the walls I’m not sure if I should use a foil radiant film – non-permeable…or if I should instead use house wrap like ‘Tyvek’. In the future I’d like to add bat insulation to the inside of the roof. I’m thinking of using foil/single bubble vapor barrier in between the roof sheeting and wood purlins. I have a concrete slab with 2″ Styrofoam and radiant heat to provide some warmth in the winter. It may not be adequate for meeting required bearing area (can be confirmed with truss manufacturer).īeams and connections should also be verified for adequacy against uplift forces, as well as deflection.ĭEAR POLE BARN GURU: I’m about to build my ‘Miracle Truss’ building which uses steel trusses with lumber purlins/girts. Here is an example, based upon assumption your building is in a minimal snow area, steel roofing over purlins, no or light weight ceiling) columns are every 10 feet, one foot overhangs and available lumber is 2×10 SYP #2 If resultant is less than 1, then beam is okay.
(Roof live and dead loads) x (1/2 span of truss + any eave overhang in feet) x (column spacing in feet squared)Ĩ x Sm (Section modulus of proposed beam) x Fb (Fiberstress in bending of proposed beam) x Cd (Duration of Load) Relying upon screws into decking only could prove to be a failure looking for a place to happen in a severe wind situation.ĭEAR POLE BARN GURU: On a 14’ x20’ building with 4×6 post 8’ tall what are the requirements for the header beam or beams? Can I use two 2x10s one out and one inside? TIM in STATE ROADĭEAR TIM: Header beam (aka truss carrier) requirements can be determined by a Registered Professional Engineer and are based upon this formula: Today’s Pole Barn Guru answers reader questions about screw penetration into decking/substrate, header aka truss carrier requirements, and a proper roof insulation solution.ĭEAR POLE BARN GURU: Should the screws for exposed fastener metal panel roofing COMPLETELY penetrate the 1/2″ plywood decking/substrate? STEVE in WARRENĭEAR STEVE: For through screws, they should not only completely penetrate any substrate, but also at least an inch into underlying purlins.
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