Hi
I'm planning a new rear 2 story extension at the back of the house and we want to knock through the rear cavity wall to increase the kitchen size. As you can see from the attached, the width of the kitchen is around 4.5M. The existing joists run parallel with the brick and block cavity wall at the rear (and so parallel to the proposed new RSJs).
The ideal installation would leave the RSJs (one for each leaf) above the ceiling and in an ideal world there would be no piers from the old wall left (shown as pier A and B) in the diagram but if it made it a lot easier we'd probably opt to keep pier B and worse case both piers.
I was thinking one order might be something like:
1/ Prop up outer brick leaf of existing cavity wall with acros and strongbouys externally.
2/ Prop up inner leaf block wall with acros internally (maybe this could be done from outside too since stronbouys should reach?).
3/ Position RSJ outside on the ground between the two sets of acros
4/ Cut a few courses of bricks and blocks out leaving a long"slot" in the wall to push both rsj in
5/ Place padstones
6/ push in RSJs from outside probably using 2 x genie lifts. Then make good, shim and motor etc, wait a few days and remove props.
Would that be the "normal" way to do it? Videos I've seen on youtube etc show the entire wall being demolished and then the rsj being placed in the gap and lifted up. If we did it that way (and had no piers so the RSJs were considerably wider than 4.5M) I can't see how we could position them since wey'd be so much wider than the room.
If I'm fortunate enough to get some good advice, I plan to re-open this thread and show pics. Might even start a general extension project post.
Anyway thanks for reading this far and thanks in advance for any advice!
I'm planning a new rear 2 story extension at the back of the house and we want to knock through the rear cavity wall to increase the kitchen size. As you can see from the attached, the width of the kitchen is around 4.5M. The existing joists run parallel with the brick and block cavity wall at the rear (and so parallel to the proposed new RSJs).
The ideal installation would leave the RSJs (one for each leaf) above the ceiling and in an ideal world there would be no piers from the old wall left (shown as pier A and B) in the diagram but if it made it a lot easier we'd probably opt to keep pier B and worse case both piers.
I was thinking one order might be something like:
1/ Prop up outer brick leaf of existing cavity wall with acros and strongbouys externally.
2/ Prop up inner leaf block wall with acros internally (maybe this could be done from outside too since stronbouys should reach?).
3/ Position RSJ outside on the ground between the two sets of acros
4/ Cut a few courses of bricks and blocks out leaving a long"slot" in the wall to push both rsj in
5/ Place padstones
6/ push in RSJs from outside probably using 2 x genie lifts. Then make good, shim and motor etc, wait a few days and remove props.
Would that be the "normal" way to do it? Videos I've seen on youtube etc show the entire wall being demolished and then the rsj being placed in the gap and lifted up. If we did it that way (and had no piers so the RSJs were considerably wider than 4.5M) I can't see how we could position them since wey'd be so much wider than the room.
If I'm fortunate enough to get some good advice, I plan to re-open this thread and show pics. Might even start a general extension project post.
Anyway thanks for reading this far and thanks in advance for any advice!
