Pitch a Roof, Up or Out, and a Site Prep Problem

Today’s Pole Barn Guru tackles reader questions about a “way to put a pitch on a flat carport roof,” when building is is cheaper to go “up or out,” and “extra” costs associated with poor site prep.

DEAR POLE BARN GURU: What is the fastest, least expensive way to put a pitch on a flat carport roof? My inclination is to use 2x material cut at 1.6 degree (3/8″/foot) across the 24′ width 16″ apart covered with 7/16″ OSB. DANIEL in YELLOW SPRINGS

DEAR DANIEL: Unless you are going to use a hot mopped or rolled EPDM roofing, you should probably be looking to do a slope of at least 3/12 for either shingles or steel roofing (steel will be least expensive and quickest). Below this roof slope shingles require added underlayment and most steel roofing paint warrantees are void. You should have a Registered Professional Engineer investigate specifics of your carport and determine a structurally sound design solution – rather than you guessing and either creating a bigger problem, or over killing and being more expensive than necessary.

 

DEAR POLE BARN GURU: My wife and I are researching pole barns with the intent of building within the next year. You’re site says it’s cheaper to build a larger footprint than it is to build up. When we built our home, our builder told us it was cheaper to build up than to build with a larger footprint. What’s the deal? JONATHAN in KENNEWICK

DEAR JONATHAN: Without comparing an exact set of variables – exact usable square footage, ceiling heights, insulation requirements, include concrete, HVAC, literally everything, I would find it difficult to predict other than they should be very, very close when all is said and done. This article goes further in depth on this vary subject: https://www.hansenpolebuildings.com/2020/02/barndominium-one-story-or-two/

 

DEAR POLE BARN GURU: Our contractor set the poles without grading the site. Now he wants to charge us $5000 more because there’s a 2′ drop. He says he needs 7 truckloads of fill dirt to make the floor level. We are building the pole barn to put our travel trailer in and now the clearance of the 12 foot door opening is in jeopardy because he has to build up the outside ramp to get to the door. What can we do? RUTHIE in SPRING HILL

Entry Door ProblemDEAR RUTHIE: To begin with your site should have been graded prior to construction starting, obviously you did not know what you did not know. Fill should not be dirt, in any case. Up to within two to six inches of bottom of your building’s splash planks should be sub base – compacted no more than every six inches. On top of this should be two to six inches of sand or sandy gravel – also compacted. Seven truckloads of fill should amount to roughly 115 yards, so if this is for proper materials, compacted, price is probably not out of line.

You could solve much of this by cutting down high spots on your site – probably at least a foot inside your building’s footprint and sloping away from your building for 10 feet outside.

 

 

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