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Ask The Trades › DIY Forum › Building Questions › Garage floor

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Garage floor (Read 18562 times)

john59 GDPR opt-out	Re: Garage floor Reply #17 - Aug 14^th, 2005, 12:26am Ok guys, now for the roof, I am planning to have a flat roof put on to replace the asbestos sheets, how would "you "do it and take into consideration the insulation and how to tie it to the concrete sections of the garage walls. Regards. John.
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woodsmith Global Moderator Trade Member Author Offline Posts: 4395 Total Thanks: 135 For This Post: 0 Gender: Trade: Joiner	Re: Garage floor Reply #18 - Aug 14^th, 2005, 7:21am I wouldn't have a flat roof, nothing but trouble IMHO
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JerryD

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Re: Garage floor
Reply #19 - Aug 14^th, 2005, 9:40am

Not easy to explain 'how to do it' without a three page post Roll Eyes

There will be many website showing how to construct a flat roof. The insulation must be continuous with the wall insulation (no gaps) or else you'll get cold spots where condensation can occur. Go for a 'warm roof' design as this avoids the need for cross ventilation. (warm roof = insulation on the top, just under the felt)

For felt, ensure the felter uses HT felt. This will last minimum 20 years (maybe longer) if done properly.

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john59 GDPR opt-out Total Thanks: 135 For This Post: 0	Re: Garage floor Reply #20 - Aug 14^th, 2005, 12:02pm Thanks JerryD I found a couple of sites that explain in detail flat roof constuction and also this site for EPDM. http://www.diyroofing.com/ Any thoughts on covering the roof with this stuff?
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JerryD

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Re: Garage floor
Reply #21 - Aug 14^th, 2005, 4:04pm

EPDM has had many bad reviews. In addition, that web link you gave shows a headline price of £7.38 m² but if you read it further you cannot buy it for that price (as far as I can see). The cheapest method comes to £9.40 m² + vat (£11.05) + delivery.

The slightly thicker, self adhesive range costs nearly double @ £20.18 m² (inc vat but again + delivery)

Finishing the edges is always a problem, I've seen some awful diy attempts at this.

If I had a new flat roof deck to cover I would get a reputable firm in and insist on ht felt.

Fibreglass is another option.

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woodsmith Global Moderator Trade Member Author Offline Posts: 4395 Total Thanks: 135 For This Post: 0 Gender: Trade: Joiner	Re: Garage floor Reply #22 - Aug 14^th, 2005, 5:51pm Jerry, how about a trussed roof? Wouldn't be that much more expensive, especially if John could roof it himself, and it could also allow for a bit more headroom?
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JerryD GDPR opt-out Total Thanks: 135 For This Post: 0	Re: Garage floor Reply #23 - Aug 14^th, 2005, 5:54pm Well I'd go for a pitched roof every time. Costs about double the flat roof method but lasts minimum 100 years (my last one did anyway ). Walls have to be able to take the weight though...........
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john59 GDPR opt-out Total Thanks: 135 For This Post: 0	Re: Garage floor Reply #24 - Aug 14^th, 2005, 6:13pm I think I will go with the felt roof method. I ave been given a price of £540 to joist board and felt the roof ,is this a fair estimate? I am in the northwest manchester area. Woodsmith, I think I will go with your method with the floor, Thanks again.
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john59 GDPR opt-out Total Thanks: 135 For This Post: 0	Re: Garage floor Reply #25 - Aug 14^th, 2005, 7:53pm Iv'e just had a terrible thought! will the garage walls support a proper felt roof? what with the joists boards and felt, after all they are only concrete panels bolted together. Maybe I should contacy a manufacturer of sectional garages and ask them. If not then would building an inner skin with blocks be the answer. Regards. John
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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: Garage floor Reply #26 - Aug 14^th, 2005, 9:39pm I'm sure the sectional walls will support the roof... "Everything you wanted to know about concrete garages, but didn't know who to ask." http://www.garages-sheds.co.uk/what-you-should-know-about-concrete-garages.html
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john59 GDPR opt-out Total Thanks: 58 For This Post: 0	Re: Garage floor Reply #27 - Aug 15^th, 2005, 5:38pm Thanks CWatters. Iv'e had the roof guys around and they said it will hold, they even took me to one that they had done and it looked fine.
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JerryD GDPR opt-out Total Thanks: 58 For This Post: 0	Re: Garage floor Reply #28 - Aug 15^th, 2005, 7:23pm Now stop talking about it and get on with it. Please post piccys as you go, we'd like to see the progress
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Village_Idiot GDPR opt-out Total Thanks: 58 For This Post: 0	Re: Garage floor Reply #29 - Aug 15^th, 2005, 8:55pm this is the stuff I'll be putting on my garage roof & they are only about an hr from the house http://www.planwell.co.uk/ i don't know if there is a distributer near you
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john59 GDPR opt-out Total Thanks: 58 For This Post: 0	Re: Garage floor Reply #30 - Aug 16^th, 2005, 4:57pm Thanks for the link, but I will be using the garage as a home cinema so it has to be felt roof for warmth and sound insulation, if I was going to put my car in it then that stuff would be an option. Thanks anyway. Regards. John.
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john59

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Re: Garage floor
Reply #31 - Aug 20^th, 2005, 7:42pm

[quote author=woodsmith link=1123786176/0#7 date=1123827442]I'm not sure if you need to comply with building regs ??? it is not an habitable room so probably not. In which case you could lay 25mm Xtratherm or Kingspan, not sure if you can get 25mm Jablite. The Xtratherm is about £14 per 8x4 sheet. Then lay minimum 1000 gauge dpm over the insulation and 150mm up the walls; then lay 18mm t&g flooring chipboard, glueing all the joints and leaving a 10mm minimum expansion gap round the edge.

Hope this helps

Keith [/quote]

Ok back to the floor, (the roof is going on very soon)
Keith you said put the 25mm Xtratherm down first, but the concrete floor is quite rough could this damage the Xtratherm when there is weight on it? If that is the case then what would you put down first.
Regards.
John.

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woodsmith

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Re: Garage floor
Reply #32 - Aug 21^st, 2005, 8:49am

John, the floor does need to be reasonably flat and not too rough but you don't need to get the floor so smooth that the Extratherm never gets punctured.

If you have access to a laser then you could use that to check the floor, otherwise, when it is dark, put a torch on the floor as you shine it across it will show any low/high spots. If there are bits sticking proud of the floor get a hammer and bolster and knock them off.

If you think the floor is too bad to just put the Extratherm onto, you could use some self levelling compound, you would probably need a few bags.

I don't think the sort of insulation used under laminate will do you much good it is too thin and don't be tempted to put any felt, old carpet etc underneath, it will almost certainly smell in the long term and make the floor creak.

Keith

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john59 GDPR opt-out Total Thanks: 135 For This Post: 0	Re: Garage floor Reply #33 - Aug 21^st, 2005, 12:22pm Thanks Keith. Will do what you say regards knocking off proud bits (ooh err mississ ) maytbe some self levelling compound would help as well. Rgards. John.
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