I've encountered a bit of a snag when we removed all the old tretex in the knee walls. I've done the same thing in 3 bedrooms where all the rafters were original and in very good condition. That is, cellulose insulation about 150mm and then internal board resulting in visible beams that we have painted with lime paint.
In the hallway, at some point, they have removed 2 rafters (every other one) and laid the beam down with brackets against the outer part of the rafter. See pictures:
I presume it's difficult to put back new beams that support the rafter and also get a nice connection to the cut part in the wall since I want the rafters to be visible. The question is how to solve this most easily? I want to achieve a result like in the other bedroom, where the wall is free so the inner construction of the rafters can be visible.
@justusandersson you usually have really valuable input on similar challenges. Do you have any idea how I can tidy this up and also make it sustainable?
I appreciate that the changes were made earlier than the 60s when the tretex was nailed up, so it has lasted for quite a few years...
One thought would be to place angle iron at the very bottom and fasten it to the outer roof truss, the recessed log in the wall, and also into the wall. My amateur assessment is that it should provide the same durability as today, and that you can then remove the horizontal log...
It's not entirely easy to understand the whole picture with just a few images. I assume it's a broken roof. Is there a cold attic resting on the collar beams, or is the space used differently? Is the outer wall at least a full brick masonry wall?
JJohan_86 said:
One idea would be to place angle irons at the very bottom and screw them into the outer rafter, the embedded beam in the wall, and also into the wall.
I'm a bit skeptical about that. You usually don't load walls in the horizontal direction at single points. You'd rather use a wall plate or a beam that spans a longer distance on the wall.
There are hardly any principal objections to replacing it with new timber, but it's difficult to get it in place. Otherwise, you might consider new "knees" (I can't remember what they're called) instead of the cut ones. The sole purpose of the horizontal beam is probably to prevent the lower legs from sliding out together with the steel bands. Then new supports are needed instead of the removed ones. I'm also a bit surprised that they lean inward slightly. Do they all do that?
One option is to install new supports and new "knees" slightly higher up than where the old ones were.
You'll notice I'm thinking out loud here, as I don't know exactly how it looks.
The wall is two bricks thick, with an attic above approximately 1.5m high. I will add some external pictures tonight for a complete view.
All the rafters slope slightly in every room, not sure if it's to avoid full load downward on the beam they connect to in the floor. This runs freely with a span of 6.7 meters.
The distance between rafters has been 100-110cm in all rooms but doubles in this hallway.
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