Tag Archives: sloping site

Endwall Overhangs, Foundation Insulation, and Sloping Ground

This Wednesday the Pole Barn Guru answers reader questions about setting trusses on a Hansen Building with endwall overhangs, a solution for an insulation question, and the possibility of building on steep sloping ground with some exposed columns.

DEAR POLE BARN GURU: Are all trusses set at the same height are the end trusses lower so the purlins hang over the end truss by 2 feet? TROY in SCAPPOOSE

DEAR TROY: Thank you for your investment into a new Hansen Pole Building.

For quickest answers to technical support questions, please refer to Page 2 of your Construction Manual.

Our buildings are designed to maximize interior clear height, so roof purlins are joist hung into sides of interior truss top chords (Detail 5/S-3 of your engineer sealed plans). In order to support endwall overhangs, roof purlins go across end trusses (detail 9/S-4). With a 5/12 roof slope and 2×8 roof purlins, this requires lowering end trusses by 7-5/8″ as shown on Sheet S-4 of plans.

You will want to review and familiarize yourself with Construction Manual Chapter 55.


DEAR POLE BARN GURU: Hi Mike! I’ve been looking for a good answer to a question that I have, your profile name suggests you might just be the guy to ask! I very much would like to put a upcoming post frame building project on a 6ft frost protected foundation, 4 ft below, and 2 foot above grade. The building will be heated and cooled, and I just have not come across the best detail on how to insulate, protect the exterior insulation, and flash between the exterior steel and the foundation insulation. What is the best way to go about this to balance R-value, appearance, and durability that come with that 2ft of above grade foundation wall. Thank you for your time! CODY in WISCONSIN

DEAR CODY: In my humble opinion, foundation walls for post frame buildings defeat much of the cost savings with little or no added benefit. I will now step off my soap box….

You can achieve same (if not better) results by adding insulation board to inside of your wall. It also takes away protection and flashing challenges. Look at using Rockwool Comfortboard 80.


DEAR POLE BARN GURU: Can any of your buildings be built where the back half of the building is suspended on poles…..because the ground slopes downhill? What about zoning? Do you check with my county to find out whether or not I can have a building? DAVID in WESTMINSTER

DEAR DAVID: Yes, some or all of your new Hansen Pole Building can be suspended on poles (basically a partial ‘stilt’ house). https://www.hansenpolebuildings.com/2017/09/stilt-houses/

While we do not check with your county to find out whether or not you can have a building, it is a very pain free process for you to confirm: https://www.hansenpolebuildings.com/2020/01/your-barndominiums-planning-department/


The Right Size, Connection, and Foundation!

DEAR POLE BARN GURU: I am considering using pole barn construction to add on to an existing metal building I have I also already have a 24×34 foundation were I want to put the add on. This will be a residential building. Would you recommend using drill in slab brackets to connect the post to the slab? COLT in EDGEWOOD

DEAR COLT: Pole barn (post frame) construction is going to be your most cost effective addition. If your foundation is adequate enough to support the weight of the new building, then drill set brackets would be the way to go. If you are unsure of the capability of the slab, you could consider using typical post frame construction, placing embedded columns just outside of the existing concrete. This would slightly increase the footprint of the proposed addition. For more reading on dry set brackets: https://www.hansenpolebuildings.com/2014/12/dry-set-column-anchors/


DEAR POLE BARN GURU: High of building, siding and ceiling or no ceiling, floors, concrete, use of lube pit? Find out as much about deferent aspects of the construction good or bad? Any comments you might have for having been around designs. As different materials used in the construction, heating and cooling? Would be greatly appreciated! Thank you! ROBERT in DENVER

DEAR ROBERT: Your question is pretty broad, however I will do my best to give answers which will prove helpful.

Construct the largest footprint and height building which you can fit on your property within Planning Department limitations and will fit in your budget. It will never be big enough.

Use post frame (pole building) construction, it will be the most economical and easiest and fastest to construct (and time is money also). Pour a concrete slab on grade, over properly compacted fill with a vapor barrier.


DEAR POLE BARN GURU: What is the suggested foundation for a 40’ x 80’ pole barn we plan to build on a slightly sloping site that has a rock shelf at ground level on the upper long and short sides? We live in mid Missouri. Thank you. GREGORY in EUREKA

7-31-12-Blog-Image-from-HPBDEAR GREGORY: Whilst it might be tempting to pour a continuous footing and foundation, I believe in the long run it will be easier and less expensive to go with post frame.


Because foundation costs are astronomical! (read about how astronomical here: https://www.hansenpolebuildings.com/2011/10/buildings-why-not-stick-frame-construction/)

Rock can be dug through. Start by calling your local power company and ask them if they have equipment for boring through rock, or if they don’t who does it for them. You can bet they have a solution for this – and many power companies are happy to make a few bucks putting their equipment to work which would otherwise be sitting idle.

Another alternative is to rent a skid loader with ram hoe attachment.