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  • FIRST POST
    • bery_451
    • By bery_451 13th Jan 18, 1:05 PM
    • 1,157Posts
    • 31Thanks
    bery_451
    Screeding ground floor foundation help
    • #1
    • 13th Jan 18, 1:05 PM
    Screeding ground floor foundation help 13th Jan 18 at 1:05 PM
    Hi the ground floor foundation in extension new build is concrete.

    What types of screeds are there?

    Is it ok to directly put screed on top of the concrete or what preparations we must do to concrete floor before screeding and what is the maximum thickness depth of the screed floor layer that is allowed for building regulations?
Page 1
    • Warwick Hunt
    • By Warwick Hunt 13th Jan 18, 1:11 PM
    • 1,153 Posts
    • 551 Thanks
    Warwick Hunt
    • #2
    • 13th Jan 18, 1:11 PM
    • #2
    • 13th Jan 18, 1:11 PM
    Why don!!!8217;t you just ask whoever is doing the floor?
    • EssexExile
    • By EssexExile 13th Jan 18, 2:05 PM
    • 2,869 Posts
    • 1,998 Thanks
    EssexExile
    • #3
    • 13th Jan 18, 2:05 PM
    • #3
    • 13th Jan 18, 2:05 PM
    Google is a mine of useful information.
    Tall, dark & handsome. Well two out of three ain't bad.
    • tonygold
    • By tonygold 13th Jan 18, 2:20 PM
    • 635 Posts
    • 225 Thanks
    tonygold
    • #4
    • 13th Jan 18, 2:20 PM
    • #4
    • 13th Jan 18, 2:20 PM
    why not just answer the guy or keep quiet if you don't know the answer.
    the whole point of a forum is to help.
    Jeez
    • Tom99
    • By Tom99 13th Jan 18, 3:06 PM
    • 2,244 Posts
    • 1,522 Thanks
    Tom99
    • #5
    • 13th Jan 18, 3:06 PM
    • #5
    • 13th Jan 18, 3:06 PM
    Your post is a little bit unclear but is this for an extension you are building to your own property?
    If it is then, whilst you might get some interesting replies, I would not rely on anonymous bods on an internet forum to write a specification for you.
    • bery_451
    • By bery_451 13th Jan 18, 3:56 PM
    • 1,157 Posts
    • 31 Thanks
    bery_451
    • #6
    • 13th Jan 18, 3:56 PM
    • #6
    • 13th Jan 18, 3:56 PM
    Yeah its DIY
    • LandyAndy
    • By LandyAndy 14th Jan 18, 9:51 PM
    • 24,317 Posts
    • 51,374 Thanks
    LandyAndy
    • #7
    • 14th Jan 18, 9:51 PM
    • #7
    • 14th Jan 18, 9:51 PM
    I had an extension built two years ago.

    After the slab there was a thick layer of insulation to which the underfloor heating was fixed and then the whole screeded with hydroscreed.
    • ComicGeek
    • By ComicGeek 15th Jan 18, 1:27 PM
    • 284 Posts
    • 236 Thanks
    ComicGeek
    • #8
    • 15th Jan 18, 1:27 PM
    • #8
    • 15th Jan 18, 1:27 PM
    Too many variables to be able to comment.

    Where is your insulation layer, what product, how deep? Any existing finished floor levels that you're looking to match to? Who did the design for the concrete slab, they should have a view on maximum screed thickness? Are you installing any underfloor heating pipes or conduit in the screed? Vertical insulation strips at perimeter of screed?

    I definitely wouldn't DIY it myself without getting specialist advice on type and thickness.
    • ComicGeek
    • By ComicGeek 15th Jan 18, 1:28 PM
    • 284 Posts
    • 236 Thanks
    ComicGeek
    • #9
    • 15th Jan 18, 1:28 PM
    • #9
    • 15th Jan 18, 1:28 PM
    why not just answer the guy or keep quiet if you don't know the answer.
    the whole point of a forum is to help.
    Jeez
    Originally posted by tonygold
    No one is going to know the answer from the information provided, that's the whole point of the responses.

    Anyone who does give a straight answer to that level of input is very unhelpful to the OP!
    • Furts
    • By Furts 15th Jan 18, 2:14 PM
    • 4,289 Posts
    • 2,782 Thanks
    Furts
    why not just answer the guy or keep quiet if you don't know the answer.
    the whole point of a forum is to help.
    Jeez
    Originally posted by tonygold

    But you are the lone wolf here. Look at the tone of the replies. Look at how many people are chipping in. Then see that over 1000 posts have been made by OP and only 3 thanks have ever been given. Then consider that folks who provide helpful answers end up despairing and dropping out.
    • bery_451
    • By bery_451 15th Jan 18, 5:04 PM
    • 1,157 Posts
    • 31 Thanks
    bery_451
    Too many variables to be able to comment.

    Where is your insulation layer, what product, how deep? Any existing finished floor levels that you're looking to match to? Who did the design for the concrete slab, they should have a view on maximum screed thickness? Are you installing any underfloor heating pipes or conduit in the screed? Vertical insulation strips at perimeter of screed?

    I definitely wouldn't DIY it myself without getting specialist advice on type and thickness.
    Originally posted by ComicGeek
    Insulation is under the concrete base, yeah want to match floor levels to existing house. No underfloor heating.

    Looking to lay 22mm gas pipes by a gas safe engineer on the concrete base before covering it with screed. This saves the labour digging a channel in concrete screed for gas pipes.

    What is the criteria for laying gas pipes in solid floors anyway?

    Vertical insulation strips mandatory for building regs? Damp proof course already there at perimeter.

    Do i need to put anything on concrete base before screeding?
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