A BONUS PBG for Friday May, 24th — Alternative Siding, Basements, and Purlin Size
DEAR POLE BARN GURU: In towns that disapprove of houses with rib steel siding, can traditional OSB sheathing on the bookshelf girts w/ vinyl cladding be substituted? Material prices seem similar and no huge difference in labor seems probable. But, will the difference change the engineering specs due to racking and deflection, etc? I.E.: could that change the bookshelf girts size or spacing? How thick would the OSB need to be? What nailing would be needed? BRIAN in LEROY
DEAR BRIAN: While pre-painted ribbed steel siding is the most durable and cost effective siding available, some jurisdictions just do not ‘get it’ and demand (as is their right) alternative sidings. When we engineer using commercial bookshelf wall girts, we limit deflection to what sheetrock will withstand, so they are effective with any type of external siding materials. No changes to structural system will need to be made, other than vertical blocking between wall girts every 4′ (in order to provide a nailing surface for edges of OSB). If you use vinyl siding, then 7/16″ OSB and a Weather Resistant barrier will be necessary. Typical nailing will be 8d common nails at 3″ on center along panel edges.
DEAR POLE BARN GURU: Can a pole barn building have a basement? CLARK in HILLSBORO
DEAR CLARK: Absolutely! We can even engineer it using a permanent wood foundation, saving you thousands of dollars as compared to a concrete foundation. https://www.hansenpolebuildings.com/2020/02/barndominium-on-a-daylight-basement/
DEAR POLE BARN GURU: I’m building a 36x64x16 8′ truss spacing . We want exposed truss and ceiling cavity without the use of drop ceiling or blown in bat. My question is it smart to use 2×6 purlins instead of 2×4 to allow for room for faced 6″ insulation to get a R19 value, besides spray foam what are some other options. Thanks. ZACH in LAUREL
DEAR ZACH: While it is smart to use 2×6 purlins, using batt insulation between your purlins will result in nothing but long term problems. Your only real answer is closed cell spray foam https://www.hansenpolebuildings.com/2023/10/properly-insulating-between-roof-purlins/
