How do you support roof to install new bi-folds?

The way I've allways done it in the bush is pull the lining off the inside. Get a bearer that looks strong enough maybe 250 x 50, long enough to go between two studs that you are keeping. Without cutting the studs right through, mortise the bearer into the studs at the hight you want it, add an extra stud at each end to hold it up, then cut the unwanted studs out level with the bottom of the bearer.
This mite not be right but it works for me. No props required.

You might want to run that by me again aussiecollector, I am having some difficulty working that out:confused:

Existing walls have 70x45mm studs, you want me to check something sturdy into these across the whole span (how many mm into the studs?) at a height where when you cut off the studs this is the top of the new lintel yeah? I then put the lintel under the bearer (or sturdy bit o wood) and then put the new supporting studs in at each end. Doesn't this mean that as the supporting beam is xx mm into my 70mm I am going to have to check all the new studs around this as well?? Wouldn't you then sort of weakenthe structural integrity of the studs?

Sorry for the confusion and thanks for the reply I am just not quite sure I have understood.

Sorry never delt with a wall that thin. Might not work. Might work if you can find a beam good enough 40mm thick, 30mm will hold the top up till you get the new beam up. What is on the outside? Is it an internal wall? Is it a load bearing wall? or is it only holding it self up? New studs dont have to be checked around bearer, except to hold them there, as they only need to finish at the bottom of the bearer. I hold the new beam op against the exposed studs and mark where they have to be checked incase things aren't quite straight.

You need to install a beam above where the new door is going to go BEFORE you take anything out.

Take off the plasterboard.

Check into the exsisting studs above the door, leaving clearance for the door, fit laminated beam.

Studs will be 90/100mm, beam will be 40/50mmx180/200mm, cut only to the size required to fit beam

Add another stud at both ends of the door opening, so as to make it double studs.

Remove studs in door opening by cutting UNDERNEATH the beam.

Simple

Or sling a chippie $400 cash to do it for you, at least you will be able to sleep without worring if its going to fall down.


Al

Hi Folks and thanks for the replies.

Have attached a couple more pics to further explain the situation. One shows how I intend to frame up the new opening (as I have a nother 2 doors that went in a new wall), One shows an external view of where the new door is going into the existing opening whilst the last one is an internal view of the wall that needs to take the door.

The corner of the house is a conventional roof (and it's a small hip so not huge wieght), the extension is of course trusses with a heay duty truss against the existing house (I am going to support the old rafters onto this and cut out some of the wall) and a couple of saddles back up into the existing roof).

Harry72, your suggestion was what I intended except I didn't know where to brace/support. I had thought proping up on the outside so I was supporting the rafters (and thus roof) directly rather than the ceiling.

Ian007, when you say LHS did you mean from the inside or out. If its left from the inside then refer comment about the extension and the fact there is a truss across from that corner. If you mean the other side then yep that corner is load bearing.

ozwinner, as before its 70mm (how uncommon are 70mm walls exactly?) studs and they have used battens to increase the size of the wall. Your suggestions sounds the same as aussiecolector which is what I don't quite understand. The new lintel is 170x45 and will be installed as per the attached picture (3 studs under and 2 jambs). I know I need to install the new lintel and studs into the existing space and had proposed to cut of the studs above the new lintel so whats left remains and become the lintel jacks, its just how to do it? Recommendation for a chippie whilst sound is not an option as I intend doing everything I am legally allowed to do on my own (so far has been a good learning exercise )

Is checking the new lintel into place and leaving 25mm on the existing studs enough to support the wall (otherwise how do you get in into position??)? Or do I prop independently as per Harry and then cut out the studs and fit new framing.

Phew - sorry for the long winded reply

I should also have said that on the internal wall photo the bigger window has been removed and framed to take the new extension wall (as shown on the external shot). The smaller window down the end will come out beacuse of all the studs supporting the new lintel.

Hey echnidna, the 45x170mm lintel is what was engineered and detailed on the plans etc. as well as all ready purchased and sitting out the back so that's what it is going to be. Interesting your recommendation is to have the lintel directly under the top plate, any reasons for this? I had planned to have it directly above the door as per the attached photo of the framing for one of the new doors (so door frame is fixed directly to lintel).

Ahhhhhh ThePope, it's amazing what a difference a picture makes (and thanks). The way you have shown the prop means it sits beside (not in the way) the wall and still supports the top plate. Is that right? If so then that makes sesnse and I got not issues using 2 props to support the wall and than checking the new lintel in at 45mm from the outside of the wall and then putting all my studs in before opeiong up the doorway.

Engineering specification was 3 common studs each end so the 3 under was my interpretation of that (actually I think I asked here as well). Not sure why I went with the two jambs but hey, better to go over than under spec (actually I have probably gone over on all my tie down etc.). Engineer even specified 2 common studs each end for a 1400 window as well so go figure.

Allready have the 70mm framing timbers so it was going to be a 70mm wall because I will get rid of the battens and nog out the studs.

OK - Scratch removing the battens (DOH!! - had forgotten about the cornice etc.) Guess I am packing out the new frame work with the battens that will be removed from the opening.

A funny picture relating to what your talking about . . .

This is my house being renovated (almost finished now), the floor and wall area that has been taken out below the roof line was an after thought. Turned out the wall there was not suitable to keep, and since that area is now the bathroom, we jack hammered up all the floor and did a new slab for all the new pipe work.

Anyway, this picture shows how they held the roof up! Seemed a bit :eek: :eek: :eek: :eek: to me, but I'm no engineer! Maybe it's all you need?????