Does Wind Exposure C Apply to Wall Framing in Any Way?
Reader JAVO in PRINCE FREDERICK writes:
“I’m getting C trusses because I’m in a windy area around Chesapeake Bay, but I don’t see Exposure C applying to building frame or footers. For footers I’m being quoted 3’6″ depth, 1’8″ diameter, 5″x16″ pill, & Quikrete/sakrete, In keeping with Exposure C, should I request rebar in footers? Collars from footers to glulams? Does Exposure C apply to wall framing in any way?”
Design wind speed and Wind Exposure must both be considered. Keep in mind, your new building will only be as strong as its weakest link.
Wind Exposure is sadly overlooked or ignored by virtually every building provider and builder.
Exposure C, in layperson’s terms, means your entire structure (footings, embedment, columns, trusses, girts, purlins, bracing, connections, etc.) must be able to resist a roughly 20% greater applied force.
Here is a simplified description of Exposure C: Wind Exposure C is open to wind in one or more directions, for 1500 feet, with only scattered obstructions generally less than 30 feet tall in any direction. This would include building sites in flat open country and grasslands. Can you see ‘forever’ in one or more directions and your ‘forever’ does not include a body of water over a mile wide? You are Exposure C.
For a full explanation of Wind Exposure please read:
Important in making your building system work properly against wind loads is to order wind-rated overhead doors: https://www.hansenpolebuildings.com/2014/12/wind-load-rated-garage-doors/
I will make here a recommendation you should heed, if you are concerned about how you are investing your hard earned dollars – only build from site specific (your building dimensions and features, on your site) engineer sealed plans. This is not an expense, it truly is an investment being made to protect you, your family and your valuables.
This Wednesday, the Pole Barn Guru answers reader questions about use of hurricane straps to anchor 8×8 posts to sill plate, the possibility of adding a beam to old a loft for open concept, and if we do site specific engineering for Panama City Florida- yes.
DEAR POLE BARN GURU: Hey I’m on the starting process of building a barn and wanted to ask your opinion on something. The barn I’m building is a 40x60x16 on a 2ft block wall. My question is what is the strongest way to attach my 8×8 post to my sill plate? I’ve looked at many others and it looks like they just “toenailed” the post into the sill plate but I had thought about using these hurricane straps instead…. What do you think?
DEAR RICKY: Pour wet set brackets into the top of your block walls, like these: https://www.hansenpolebuildings.com/2019/05/sturdi-wall-plus-concrete-brackets/
DEAR POLE BARN GURU: How can I have a 26 foot span 12 feet off the wall with no poles underneath for an open kitchen areas like this? DOUG in TERRE HAUTE
DEAR DOUG: You can run an LVL beam from wall-to-wall or use prefabricated wood floor trusses. Your building’s engineer will need to adjust diameter and depth of footings under columns appropriately. For extended reading on floor trusses: https://www.hansenpolebuildings.com/2020/01/floor-trusses-for-barndominiums/
DEAR POLE BARN GURU: Do you do site-specific engineered plans for Panama City Florida? I’m trying to find someone to do our plans, quote them, and erect the building so that we can GC the rest ourselves. Can you help? Do I just tell you what I’m looking for to get a quote or how does it work? BRITTANY in PANAMA CITY
DEAR BRITTANY: Every building Hansen Pole Buildings provides comes with site specific engineered structural plans and verifying calculations. We are not, however, contractors, so the great majority of our clients erect their own building shells following our detailed step-by-step instructions. We would appreciate the opportunity to participate in your new home. Please email your building floor plans and elevation drawings (even if rough or just photos), site address and best contact number to our Design Studio Manager Caleb@HansenPoleBuildings.com 1(866)200-9657 Thank you.