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Timber Frame Bank Barn Design Concerns

Started by Anjou, January 04, 2025, 09:00:04 PM

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Anjou

Happy new year to you'ns!

Trying to get the Mennonites to build me a 2-story, 30'x40' Pennsylvania Bank Barn (30'x40'), with a 7:12 asymmetric roof.  The recurring response to my structural concerns about their design ideas is: "you should be OK."  All measurements below are the true size, not nominal dimensions -- the Mennonites are recommending hemlock for the structural timbers.  After wasting a year, I will be having the plans drawn up by an experienced draftsman, after consultation with a structural engineer.  The main bay (20' wide x 24' deep) of the upper-level needs to simultaneously support two 9'x18' hay wagons, loaded with 50-pound small bales.  The overlays are supported beneath on 12"x14" Summer beams atop 12"x12" posts.  The span for the summer beams is 13-14'.  The span for the overlays is 11-12'.

Issue 1:  Spanning the 20' great door opening, while supporting the roof.  You should be OK with an 8"x14" beam.
Issue 2:  Spacing 8"x10" overlays and 2"x8" T&G flooring.  You should be OK spacing them at 30" o.c.  Note that the Mennonites had suggested 1.5" T&G flooring and 6"x8" overlays at 30" o.c.
Issue 3:  Your grandmother should have no problem sliding open the 10'x12'x2" great doors.

What do you think?  Thus far, I've been basing my opinions on a 1910 barn framing sketch (not sure how to attach that) and my very limited observational experience.  I have serious reservations about their structural engineering abilities.

Jim_Rogers

As I see it you have two choices.
Run the numbers yourself and verify if the timbers can support the load and span.
Or hire a timber framed experienced structural engineer to review the design.

Good luck with your project.

Jim Rogers 
Whatever you do, have fun doing it!
Woodmizer 1994 LT30HDG24 with 6' Bed Extension

Jim_Rogers

Quote from: Jim_Rogers on January 05, 2025, 09:24:26 AMAs I see it you have two choices.
Run the numbers yourself and verify if the timbers can support the load and span.
Or hire a timber framed experienced structural engineer to review the design.

Good luck with your project.

Jim Rogers
And of course, option #3, accept their design decisions.

Jim Rogers
Whatever you do, have fun doing it!
Woodmizer 1994 LT30HDG24 with 6' Bed Extension

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