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Chat Area => General Discussion Area => Topic started by: pauls on 13 January 2015, 14:30:47

Title: flat roof
Post by: pauls on 13 January 2015, 14:30:47

I need to replace the flat roof on my daughter play room(shed). It is 16ft by 16ft. I know I should put a apex roof on this but due to restrictions I cant so I was going to put a slopped roof on it. Going from the back to the front. 
My question is would 12" slopping down to 2" at the front be enough to ensure a good rain run off. I am going to use 18mm ply then 2 layers of self adhesive roofing felt.

cheers for any help

Title: Re: flat roof
Post by: The Sheriff on 13 January 2015, 14:36:57

That would be just about enough to ensure the rainwater escaped. Don't forget to put a piece of batten at either side and felt over it to stop the water coming off the sides.

Title: Re: flat roof
Post by: 05omegav6 on 13 January 2015, 14:50:14

Sounds like the perfect candidate for fibreglass...

Our house has a flat roof and drops about 8" over 40' with no issues :y

Title: Re: flat roof
Post by: Marks DTM Calib on 13 January 2015, 15:01:03

I would advise considering using EPDM:

http://www.rubberroofs.co.uk/index

Easy enough to install and very robust, plus it can tolerate the expansion and movement associated with a wooden structure.

Title: Re: flat roof
Post by: Rods2 on 13 January 2015, 23:40:32

Quote from: Marks DTM Calib on 13 January 2015, 15:01:03

I would advise considering using EPDM:

http://www.rubberroofs.co.uk/index

Easy enough to install and very robust, plus it can tolerate the expansion and movement associated with a wooden structure.

Thanks for the link, I need to replace the felt on three flat roofs this summer and will now use the rubber roofing where looks very cost effective, easy to apply and lasts longer than felt solutions. :y :y :y

Title: Re: flat roof
Post by: Broomies Mate on 13 January 2015, 23:48:01

A 10" Slope over 16'

Or in proper measurements 250mm drop over 4870mm span is a decent rake and will allow water to cascade very well.

Conversion is done in my head so only approximate!

Title: Re: flat roof
Post by: Sir Tigger KC on 14 January 2015, 00:40:06

So are there 12, 14 or 16 inches to a foot?  :-\  ;D

Title: Re: flat roof
Post by: 05omegav6 on 14 January 2015, 11:14:43

Quote from: Sir Tigger on 14 January 2015, 00:40:06

So are there 12, 14 or 16 inches to a foot?  :-\  ;D

Depends who's asking really... Obviously there are times when a foot is 5-6"... :D

Title: Re: flat roof
Post by: Shackeng on 14 January 2015, 15:01:33

You may need building regs for this, if so and you don't bother, it may cause problems when the house is sold.

https://www.gov.uk/building-regulations-approval/when-you-need-approval

 :y

Title: Re: flat roof
Post by: Marks DTM Calib on 14 January 2015, 15:17:46

Quote from: Shackeng on 14 January 2015, 15:01:33

You may need building regs for this, if so and you don't bother, it may cause problems when the house is sold.

https://www.gov.uk/building-regulations-approval/when-you-need-approval

 :y

Building regs are not required as it is not a habitable space  :y

Title: Re: flat roof
Post by: Shackeng on 14 January 2015, 18:56:42

Quote from: Marks DTM Calib on 14 January 2015, 15:17:46

Quote from: Shackeng on 14 January 2015, 15:01:33

You may need building regs for this, if so and you don't bother, it may cause problems when the house is sold.

https://www.gov.uk/building-regulations-approval/when-you-need-approval

 :y

Building regs are not required as it is not a habitable space  :y

Just spotted the shed bit. :-[

Title: Re: flat roof
Post by: Vamps on 14 January 2015, 23:45:25

Quote from: Shackeng on 14 January 2015, 15:01:33

You may need building regs for this, if so and you don't bother, it may cause problems when the house is sold.

https://www.gov.uk/building-regulations-approval/when-you-need-approval

 :y

I think I may have broken one or two of those.......... ::) ::)