Browse Forums Owner Builder Forum 1 Apr 08, 2014 11:02 pm Hi all thanks for reading the post. I am changing my carport into an activity room with a toilet. Have all the council approval etc. Any way, this is what is need to to, really hope someone can have an answer for me as i am stuck what to do. . 1. Lay new footing and sealed slab. 2. I would have to either Acrow the roof, knock down the existing 4 pillars then lay new footings then brick up to the support beams. How is this possible as the acrow supports would be sitting where i want to poor the slab? 3. Anyway, has anyone here supported a roof before or is there another way round this where i dont have support the roof but can lay new footing and slab then brick up. Any help would be appreciated... cheers guys. Re: Proping the roof? 2Apr 09, 2014 3:35 am ? type of roof. if its a light weight skillion attatched to house , should not be to hard with 2 acro props per corner with a beam and legs of props outside the slab formwork. all depends on weight supported , if its trusses and tile you may need too set in posts as required to support existing roof, them pour slab up to and around the new posts or post piers as required. any piccs , more info needed. Design from top down to ground , build from ground up Re: Proping the roof? 3Apr 09, 2014 6:57 pm Cheers for the reply m8.. Jarraha beams and tiles... here some pics.. [url][URL=http://s31.photobucket.com/user/uk_in_oz_racer/media/20140216_155847.jpg.html] Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ [/url][/url] Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ cheers M8....... Re: Proping the roof? 4Apr 10, 2014 2:08 am perthbud good pictures, luckily you have an eave over hang , so my thoughts are an under beam along the eaves and as many acro props you can get ya hands on , a good start would be every second truss, and a good solid board under each prop. cheers wobbly Design from top down to ground , build from ground up Re: Proping the roof? 5Apr 10, 2014 8:06 am Hi m8, it seem i think, the wooden beams in the last pic are just there to nail the eve bored to and also give outward support to the roof... The bit i actually need to prop would need to be metal beam you see on the left hand side that goes all the way round the carport. Hense i am unsure how this will be supported if i need to lay new footings and slab. How many Acrrow props? cheers m8.. Re: Proping the roof? 6Apr 10, 2014 1:00 pm You dont really show the metal beam that clearly in your photos, but if it is one solid beam all the way through (One piece not two) I would be putting Acrow props roughly where each of your existing pillars are. So you can pour your footings without the Acrows in the way, straddle one each side of your Footing trench and use a timber beam between them to support the Roof weight buy pushing up from both Acrows onto that metal beam. Once your Footings are dry (and depending where the slab and new wall are being run to, you should be able to put single props on the footing line in place if the Double props used to straddle the trench. then your Can pour your Slab. As for total number of support points that will depend on where you prop it but you have 4 pillars so at a minimum I would say 4 prop points (which equates to 8 Acrow props as you need them in pairs to straddle the trench) but putting an extra couple in at each end wouldn't be a bad thing. Once in Just wind them up slowly so they are taking the weight of the roof and just slightly lifting the support beam off the existing brick pillars. then big hammer and knock em down! PS: Might also be a tie down rod from the Steel beam to the Pillar so take a look for that. PPS: Looks like you are creating an entry from the house into the "new area". have your thought about floor levels between the existing house and this extension? You may (probably) need to build up the soil in the old garage (Making sure it is well compacted) before digging footings and laying your slab. Otherwise you are going to have a step down from the existing house to the new floor, which would be a pain (and is bad practice to have a step at a doorway as a terrible trip hazard) It can easily be avoided if you sort out the levels now so you can run it through nice and level. https://forum.homeone.com.au/viewtopic.php?f=38&t=44762 My Owner builder journey extending a 1930's Bungalow Re: Proping the roof? 7Apr 10, 2014 7:34 pm cheers for the good info docker rob.. i have added some more pics below. The beam is in 3 separate parts ie full beam on each of the 3 separate sides....So the longer side is 1 full beam. Yes i have though about acrowing either side of the footings so i can poor them, when dry build up from there. 1. say if 8 acrows where in line around the sides on the new footings could there be more sway to the hole roof until its properly done? would this be safe? 2. My engineering drawing show the slab half sits on the footing. the external brick work will support the eaves etc and the internal brick work will sit on the slab which i sitting on the footing and is then built up to support the roof. I have knocked out the middle bricks as there will be a inset larger mirror here. No i am not at this stage putting door through from the house. It will have french doors at the front and a single door at the back with a toilet inside as its for a business which at this time we want to keep separate from the house. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Proping the roof? 8Apr 10, 2014 8:35 pm As the beam is in separate parts you are going to have to prop each beam area individually at each end. Not hard just more props. It's pretty obvious where the support points are so no hidden surprises. Don't worry about it swaying, it's all tied in well. Only issue is it falling downwards. (Unless we get a cyclone, but then we all have bigger problems to worry about!!!) So make sure your acrows are stable and they won't slip out. May be a bit daunting looking at it but it will be fine. PS are you the guy doing the hairdressing thing for his wife? I remember someone on here asking about that a year or 2 ago? https://forum.homeone.com.au/viewtopic.php?f=38&t=44762 My Owner builder journey extending a 1930's Bungalow Re: Proping the roof? 10Apr 10, 2014 11:07 pm Nah mate not a builder but spent 2 years 7 days a week doing my place so learnt a fair few things. Not far from you as I am in mt lawley, and happy to help if I can. That said I'm sure you will be fine. https://forum.homeone.com.au/viewtopic.php?f=38&t=44762 My Owner builder journey extending a 1930's Bungalow Re: Proping the roof? 11Apr 10, 2014 11:21 pm kool, you see the first pic where i have cut out the external bricks so i can have a large recessed mirror... wonder if it will be ok when i lay the new slab that it buts up to the bottom of the external bricks? you would think that the new slab should but up to the old slab but wont be able to if them external bricks are in the way. Re: Proping the roof? 12Apr 11, 2014 4:01 pm I dont see it being a problem as the new Room is essentially separated from the existing building anyway. Should be fine. https://forum.homeone.com.au/viewtopic.php?f=38&t=44762 My Owner builder journey extending a 1930's Bungalow Re: Proping the roof? 13Apr 11, 2014 5:45 pm It comes down to experience and design. I would have used SHS sacrificial posts set into footing. that would have avoided Acrow props and all would have been built in. Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Proping the roof? 15Apr 11, 2014 6:19 pm Square Hollow Section metal post set into footing below new footings and aligned so it becomes part of a new wall Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Proping the roof? 17Apr 11, 2014 7:02 pm Talk to your designer who prepared your plans I am happy to point you in the right direction but I cannot design it for you Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Proping the roof? 18Apr 12, 2014 10:48 am perthbud hi m8, do you have a link i can view? still no understand how that would work? cheers What B.E is talking.about is using steel posts embedded in your strip footings to act as the piers to hold up the roof. (You could even drill and bolt them to your Strip footings if required if you put them in after laying your Strip footings) Basically he is suggesting you concrete them in and leave them in place forever. You need it sized / engineered correctly to support the load, and aligned perfectly where your cavity will be in the brickwork, so when the wall is built they are hidden away. Looking at your pics you would also want the top designed with some type U shaped plate to slide in on that existing beam so it couldnt slip off. But an Engineer would confirm all that. Depending how you did it you would still probably need to acrow prop the existing structure whilst you remove the brick piers, but then when you pour the strip footings you bung in your new steel posts and once set can remove the acrows. Then those new steel posts just stay there and the brickwork is built around them. Thus the brickwork is not holding the load of your roof just the steel. Upside of this method is acrows don't get in the way of brickies when they build the new walls. Certainly a good option, and as they say more than one way to skin a cat. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Although designed for a different purpose it would be a bit like these columsn. The one far Right has already been bricked in. https://forum.homeone.com.au/viewtopic.php?f=38&t=44762 My Owner builder journey extending a 1930's Bungalow Re: Proping the roof? 19Apr 12, 2014 11:56 am Great interpretation from docker_rob As I said talk to your designer, he should have given you the options, Acrow propping roof by inexperienced builder is something I would avoid. Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Proping the roof? 20Apr 12, 2014 12:13 pm Brilliant docker, that is a good example right there. The issue i have is the metal beam in pics that i want to support is directly in line upwards where the load baring internal bricks would go. So to make this work i would have to have a larger footing with a very large cavity space. Not sure this would be good. Just another question lads..In the below pics, the metal beam i want to brick up to would mean the top section around the outside where the beam is will be pretty hollow when i put the plaster board up..I suppose it should really brick up to the joists and remove the beam which would be pretty involved. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ P.S really appreciate you help guys and love this forum. 2 9447 This certainly doesn't look good. I would be engaging with an independent inspector to have a look at this. 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