Rafter tie replacement

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Posted by: from Toronto
11/23/2020 at 3:48:21 AM

We are opening up the ceiling in our kitchen to a vault/cathedral type from basic flat. House was built in the 70s, standard rectangular hip roof with 5/12 slope, ceiling joists (some of them) were doubling as rafter ties. Ridge board (not beam) and split/offset load bearing walls interior. Plan was to use 4/6 beams to replace rafter ties from outside wall to load bearing interior wall, span 12 ft, at 48" oc. My husband wants to go with LVL basically 2x10x14 for overlap on load bearing interior wall. Will LVL work the same as stick wood used as a rafter tie? How would you connect it to the rafters and the walls (sill plates?) Since the ties are to resist thrust on the walls, and there shouldn't really be any heavy structural load resting on them, do I need to worry about them sagging?

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Jeff from JTL Construction in Winnipeg
Date/Time11/23/2020 at 9:07:17 AM

Good morning Mary

To take the guessing out of your game plan you should be consulting an engineer who wirks off snow loads spans and may require upgrading teleposts to handle extra load on opening this project should involve permits. Also the size of LVL will be determined by engineer. Here is photo of a flush beam lvl we just installed in hip roof. Required permits engineering drawings etc

Rafter tie replacement

Rafter tie replacement
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Date/Time11/23/2020 at 6:52:58 PM

Mary, I totally agree with Jeff. Before you even consider opening up the ceiling, consult with a structural engineer. He/she will advise you what is required to achieve the results you are looking for. Don't do anything without the proper knowledge and permits. If you do, it could be dangerous and void your house insurance.

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