I live in a house with a crawl space foundation from the late 1800s (timber construction).
Began a major renovation in ~1/3 of the house during the summer of 2009. So far, I've replaced the floor joists and windows on the ground floor, after which the ceiling, including the intermediate joists, will now be examined before the walls get their turn.
The existing intermediate timber joists have dimensions of ~200x170 with a spacing of ~1100 and a span of 7m.
It is a two-compartment construction, with a partition wall supporting the joists placed ~2.40m from the outer wall. Both the ceiling on the ground floor and the floor on the upper floor consist of tongue and groove planks of varying width ~22mm (hardly need to mention that it's shaky on the upper floor?)
The idea was to raise the ceiling height on both floors (since I have full standing height in the attic). I planned to keep the existing joists visible from the ground floor (however, they turned out to be damaged due to previous water damage). A new ceiling on the ground floor (13x120 smooth panel) would be attached to the beams from above.
To support the floor on the upper floor and achieve sound insulation, my plan was as follows:
In the outer walls (longitudinal), beams of the same dimension as the new joists would be anchored (with French wood screws or bolted through the beams in the wall), to create a flat surface to connect the new joists to. The new joists would then be anchored to this beam with joist hangers (anchor nails or anchor screws).
Initially, I thought of 45x170 with CC-600, but after following other threads in the forum, I am now unsure if anything other than 45x220 should be considered?? However, it feels like a substantial, perhaps unnecessarily over-dimensioned improvement compared to the existing construction, doesn't it?
Grateful for tips and advice regarding dimensioning and spacing!
Began a major renovation in ~1/3 of the house during the summer of 2009. So far, I've replaced the floor joists and windows on the ground floor, after which the ceiling, including the intermediate joists, will now be examined before the walls get their turn.
The existing intermediate timber joists have dimensions of ~200x170 with a spacing of ~1100 and a span of 7m.
It is a two-compartment construction, with a partition wall supporting the joists placed ~2.40m from the outer wall. Both the ceiling on the ground floor and the floor on the upper floor consist of tongue and groove planks of varying width ~22mm (hardly need to mention that it's shaky on the upper floor?)
The idea was to raise the ceiling height on both floors (since I have full standing height in the attic). I planned to keep the existing joists visible from the ground floor (however, they turned out to be damaged due to previous water damage). A new ceiling on the ground floor (13x120 smooth panel) would be attached to the beams from above.
To support the floor on the upper floor and achieve sound insulation, my plan was as follows:
In the outer walls (longitudinal), beams of the same dimension as the new joists would be anchored (with French wood screws or bolted through the beams in the wall), to create a flat surface to connect the new joists to. The new joists would then be anchored to this beam with joist hangers (anchor nails or anchor screws).
Initially, I thought of 45x170 with CC-600, but after following other threads in the forum, I am now unsure if anything other than 45x220 should be considered?? However, it feels like a substantial, perhaps unnecessarily over-dimensioned improvement compared to the existing construction, doesn't it?
Grateful for tips and advice regarding dimensioning and spacing!
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