Browse Forums Renovation + Home Improvement 1 Feb 08, 2015 1:54 am I intend to extend the roof of my alfresco slightly if possible. The extension will be 1 metre to the rear by about 3 metres wide and 1.3 metres out to the side by about 4 meters wide of my rectangle shaped alfresco. The other two sides of alfresco are to existing house walls. Alfresco under existing roof line. I will have a colourbond roof on my new house over alfresco already. I will be running timber rafters from the existing trusses I guess as I will have metal facia and 450mm eaves. The roof of the extensions will be polycarbonate and the underside of the rafters will have evenly gapped timber slats. I will obtain the fall of the roof sheeting back into the existing guttering to collect rainfall using various height timber battens ontop of the rafters. I was thinking a whaler board attached to those heavy duty galvanised fascia brackets for my 25 degree pitched roof on existing house to tie it in or is that overkill for the short roof line extensions? Are there alternatives taking into consideration the minor extension length out wise of roof line? If not, what spacing should I be looking at for the heavy duty fascia brackets, every existing truss end? I have seen a stiffner timber in place attached to the side of the timber truss in diagrams before bolting on the fascia brackets. Is the whaler board the way to go, the top of which would be the lowest batten for roof sheeting just over gutter height to allow water to run into existing gutters? So I guess I am looking for requiremets for this to be compliant for construction. How many of these heavy duty fascia brackets (if required) would I need? One for every truss end to tie in? Will I need to apply for a building permit considering it will be a new house and the size of the roof extension intended? What size timber required for the new extending rafters (1 metre long one side and 1.3 metres long other side. Rafter spacing? There will be timber posts to attach the support beam for the rafters to attach to. What would be my 100x100 timber post spacings for this project? Am I asking too much from this forum or just asking too many questions. Any expert guidance is appreciated. The exact same roof line extension exists on a display house of our chosen house but the method of attachment to the dwelling of roof extension was just a bit of a mystery to me from looking at it on display home. Thanks anyway guys and girls. I am using a volume builder for my house (Simonds Homes) so doing things like getting in before roofing to attach brackets would not be authorised I know already. To get this project added to the build as a variation would be far far too expensive. I am pretty handy on the tools I believe and have some limited building experience under the guidance of a builder I used to be a builders labourer for. This project is just one of those jobs my wife wants me to do. It is on the "To do" list. Re: extending alfresco roof 2Feb 08, 2015 2:28 pm Have you got a pic of this roof design which you are trying to copy? Blocking/stiffening the rafter/truss tails is the easiest way to go. You will however need to get Simmonds to approve allowing you to do this before the eaves go in. As for timber sizes, 75x50 would go 1m no probs, but there are a few more factors than that. If you are worried about approvals, why don't you have it put on the plans but noted as built later "proposed future extension by owners" This extension also has to remain within the required boundary setbacks so there are a few things to think of Re: extending alfresco roof 3Feb 08, 2015 2:52 pm Hi goody59, Not sure what state you are in but I am a building officer here in SA and any attachments to existing roofs needs approval regardless of the size. If the attachments are less than 4m, you can avoid having to get an engineers report and can use rafter strengthening brackets or timber stiffeners at max 1200 centres. The length of the brackets/stiffeners depends on the eaves/wall but generally 1500 would be sufficient. I know this doesn't answer all of your questions but I hope it helps! Re: extending alfresco roof 4Feb 08, 2015 3:58 pm 33amc Have you got a pic of this roof design which you are trying to copy? Blocking/stiffening the rafter/truss tails is the easiest way to go. You will however need to get Simmonds to approve allowing you to do this before the eaves go in. As for timber sizes, 75x50 would go 1m no probs, but there are a few more factors than that. If you are worried about approvals, why don't you have it put on the plans but noted as built later "proposed future extension by owners" This extension also has to remain within the required boundary setbacks so there are a few things to think of Thanks for the tips there. You make some good suggestions. Re: extending alfresco roof 5Feb 08, 2015 3:59 pm ntonk Hi goody59, Not sure what state you are in but I am a building officer here in SA and any attachments to existing roofs needs approval regardless of the size. If the attachments are less than 4m, you can avoid having to get an engineers report and can use rafter strengthening brackets or timber stiffeners at max 1200 centres. The length of the brackets/stiffeners depends on the eaves/wall but generally 1500 would be sufficient. I know this doesn't answer all of your questions but I hope it helps! That is some great input, thanks for the reply too. If your patio is going to be 35 sqm then that's going to need Council Approval. The fact that they previously approved your 25sqm patio will be irelevant 1 2655 Ask for some kickplate to be added and also for tradies to be requested to use lanyards on tools on that side of the building. Be respectful and have the discussion… 1 672 There is insufficient information to give a meaningful answer. You should talk to council planning. Apart from building construction issues, if you are adding floor area… 1 2285 |