I have a beam running right through the kitchen, where there used to be an inner wall. I'm considering if it's possible to remove it somehow, either by placing a new one in the attic and hanging the floor joists from it, or by rebuilding the roof trusses to handle the greater span.
The house is from 1947 and I spontaneously think the dimensioning looks a bit weak, so it might not even be possible, especially if it is to be approved according to current standards. It is insulated with sawdust and the attic is only used for checking leaks, ventilation, and the chimney.
The three different options I have considered are:
1. A glulam beam on top of the bottom chord. For example, 56x225. However, this one has 4m between the support points, compared to 3.4m for the current beam. If this is a good option, what brackets can be used to hang the floor joists from? Ridge hanger might not be exactly right?
2. Set support legs on the roof trusses somewhere, which the floor joists can hang from, with or without a longitudinal beam (see the timber guide example). However, they have sturdier dimensions on the upper and lower chords.
3. Rebuild the roof trusses to W-model.
It is cramped in the attic, so it would be nice to avoid a collar tie if possible.
Has anyone done anything similar, or have any ideas?
PS, mod is welcome to move this to Building Physics.
Option 1 is the simplest and best. With the limited span of the attic beams, their substantial dimensions, and the minimal load on the attic floor, you almost don't need any reinforcement at all. A 56x225 mm glulam beam on the top side of the attic beams. The best fastening is flat steel attached with through bolts.
It's not always easy to assess this type of question offhand. There are too many parameters. I never dare to answer without first making an estimate. Then you can count on a high timber quality in a house from 1947.
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