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Roof making

Roof making
First project, quite a low tech one... but hey...

Not that long ago, I purchased a building whose roof was made of cement sheets known to contain asbestos. As I intended to move in with my wife and kids, there was no way I was keeping it like that: So I decided to change the roof for a standard tiled roof.

An experienced mate of mine help me a lot and I thought I would pass on the info as it is really quite basic and really good fun.
 
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Step 1Calculation and planning

Calculation and planning
First step is to get your figures right and order the materials. In our case, the roof is a very simple shape with just 2 planes. Each side will be about 4 meters in the slope and about 6 meters in length.

To decide on what section of wood you should use, you need to do some basic calculation:
You need to know:
How heavy are the tiles per square meter: Mine are 20 tiles/m2 and each weighs about 2.5 kilos so roughly 50 k/m2 (you can find this info in the tile manufacturer documentation(pdf))
How much snow/wind can you get in the winter: This depends on your altitude and location. I've got some tables that says for me, I need to add 70kg/m2, this is quite a lot but I live at 500m above see level and in a montaneous region.

With this, you should be able to calculate the weight per m2 that the roof will have to carry. I was quite conservative and went for twice the weight: It was my first roof and I'm putting my kids under it remember !!

You pay wood by the cubic meter, so, especially if you're doing a large roof, you don't necessarily want to oversize everything.
If you want to fine tune the cost, you can take into account the slope of the roof which alters the figures a bit, probably worth bothering if your roof is large and quite sloppy.

This photo is a before photo (it was shot in june, the finished one in february, hence the gloomy look... don't say it was better then please)
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25 comments
Apr 5, 2011. 2:25 PMjimmy544 says:
The top of the rafters should be on the sides of the ridge, and the where are the birds mouth cuts on the rafters at the top of the wall.
Feb 21, 2008. 4:34 PMleebryuk says:
Good Job. I should note that the asbestos in the roof would not cause a problem, unless you yanked it out. The asbestos is impregnated in the substrate and is just about impossible to get out, unless you find a way to make it into a powder (like sawing it.) I went to York Uni and a better part of the damned place used asbestos reinforced concrete. It wasn't a health hazard, but it weirded some people out. Besides structural support, the great thing about the asbestos cement roofs is that they will not burn, nor will they decay over the decades. And as we well know, the wet British Isles weather will eat about anything over time. In the future, there are products that seal the roof from underneath and increase it's RF factor in one go! But still, well done. The roof came out looking quite nice and professional.
Mar 11, 2007. 5:01 AMSimianmanual says:
Just interested. What was the cost savings benefit of purchasing the existing foundation and remains of the structure versus erecting one from scratch on empty land? I imagine it was significant or you wouldn't have done it. The reason I am asking is the structure didn't look very secure in the first picture with the leaning wall. Personally I would not have had the courage to try and restore it for use as a home instead of for a workshop or a studio. I am guessing empty land is very costly/rare where you were, yet cheaper with an existing dilapidated structure upon it? Excellent results though. Good job.
Apr 3, 2007. 10:09 PMJohnnyL says:
Just wondering what you did with the Asbestos sheets. Its really great stuff. Personally, I would have kept it. You would have had no Asbestos exposure with that particular product. Cement Asbestos board, or "CAB" has all the asbestos contained within the cement. it has good insulation qualities, and it is classified as "Non-Fryable: meaning, the asbesos content cannot become airborne. Which is the only hazard with Asbestos. That CAB roof would have been in good condition a 100 years from now if left alone. The one definite drawback of CAB is it is truly ugly. But from an engineering viewpoint, its about as perfect as a product can get. I have worked with the US state department and the US dept of defence on Asbestos jobs around the world. I worked on the Oregon capitol building removing the asbestos there and there was a lot of it but, I do know something about this subject though. It looks like a great property and I hope you have lots of fun with the renovations! JL
Mar 17, 2007. 3:46 AMSimianmanual says:
I agree, I wouldn't want to live in a caravan park. Living in the french alps must have been beautiful. Were there any other structures on or near the property? The reason I ask is that I am wondering what the was benefit of an old bread oven over an old house, for example, that needed fixing up. The dampness might put me off. I imagine you were able to sell it for quite a bit more than what you bought it for? It's good for a single artist or a weekend vacation cottage. Maybe you could rent it out. Are there any pictures of the job from the inside?
Mar 15, 2007. 9:15 PMerik.teichmann says:
Just wanted to pop in a quick suggestion. Anyone who is putting a roof on like this ought to invest in "Hurricane Brackets". These are basically little strips of metal meant to better hold the roof on in high winds. Example here http://www.powrfab.com/Pages/Misc.htmlhttp://www.powrfab.com/Pages/Misc.html (Number HC1). These hold on a bit tighter than just nails, and are required by the 2006 Uniform Construction Code. Wasn't sure if you used these, maffiou, but thought I'd make the suggestion to anyone doing the same.
Mar 16, 2007. 12:58 PMerik.teichmann says:
Oh, absolutely, and it looks like great work. I just wanted to mention that for anyone else that was building a roof.
Aug 9, 2006. 2:24 PMdoitmyselfchic says:
Wow.. all that hard works makes me want to hire someone :D My husband and I are looking to purchase a large/old bed and breakfast to remodel and make our perm. home. It needs a new roof.. and I seriously doubt we have what it takes to consider it a DIY project. Are you putting up clay tiles or something like terra cotta? Pretty Cool! Good work!
Jul 3, 2006. 10:48 PMCannedAm says:
Steps 13-15 could be elaborated A LOT MORE.....what kind of tiles are they? Show pictures of them going up one at a time.... next roof: more pictures. Love the bldg love the roof :)
May 16, 2006. 5:53 AMironsmiter says:
I'd be interested in seeing a close-up of how the facade tiles were hung/attached... that has me a little confused. Nicely done space, but did you really move in that small space with your wife AND kids? It looks like a beautiful office/workshop/garage, but there doesn't seem enough room to fit a kitchen, bathroom, living/dining, AND multiple bedrooms. mabey i'm just missing something. I could see a single man living there quite contently, while fixing the place up, and even a couple,. But with children, it just seems too small. of course, that's probably part of why you're working on a "much bigger place" my metric conversion calculator is rusty, butthose tiles must be THICK to require such large, closely spaced rafters. Hard to tell from the pictures, but those look like 80mm square timbers. I built a simmilar roof, though using terra cotta tiles, that required only 40 by 60 mm boards(2X6dimentional lumber is close to 40X60 I think) I envy your morning cup of coffee on those roof weekends. the view looks spectacular! when you get time, let's see some more of those photos. but don't rush. We understand, with this project, you were litterly trying to keep a roof over your head!
Apr 10, 2006. 6:13 AMstib says:
It's not that toxic but there are stories of people with minimal exposure to asbestos fibres coming down with mesothelioma thirty years later. In Australia we've just been through a big class action with the makers of asbestos, and some of the claimants were people like the wives of asbestos workers who contracted this incredibly nasty form of cancer just from washing their husbands work clothes. It's really not worth taking any risks with this stuff.

Some tips:
Try not to break it, and do not use cutting tools that kick up dust. Especially, do not use power tols on it ever.
Keep the asbestos wet at all times, this keeps down the dust.
Double bag it and mark it clearly as asbestos.
Get yourself some tyvek overalls, and dispose of them at the end of the day.

more at http://www.nsw.gov.au/fibro/brochure.asp
Mar 9, 2006. 12:38 PMbrob says:
I'm just itching to do some DIY now. Nice work.
Mar 2, 2006. 11:42 AMpolossatik says:
good job! always nice to see before - inbetween - after stuff.. if you have the time, please do post some more things you have done
Mar 7, 2006. 7:54 AMSenseless says:
Nice Job! Did you have to do anything special to remove the asbestos?

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Author:maffiou