Results 1 to 11 of 11
Thread: Floor cupping need expert advice
-
6th March 2008, 05:24 PM #1
Floor cupping need expert advice
Ok black butt timber flooring laid about 6 months ago wide boards about 140mm room area is about 5m x3 m.The floor has been layed on 100x40 joists which are held in place by stirrups as there used to be an old slab there so some of the floor is on 100x 45 and other spots its on 20x 45 battens there is little room under the joist maybe 50mm or so and there is no venting under the floor plus it’s a open plan bedroom with a bathroom at one end behind a timber wall. The entire floor has been painted white so all the boards are sealed.
I look at the bedroom today and every board has cupped dramatically and two of the boards have pushed up 200mm yes 200mm overnight we haven’t had any big downpours and under the boards looked dry.
Whatdo yareckon
-
6th March 2008, 07:07 PM #2
If the boards have cupped (hollow on top) then the bottom suface has grown. This means the bottom of the board has absorbed more moisture than the top has. If you have only painted the tops of the boards and not the bottoms this may be causing/exacerbating the problem. Lack of sub-floor ventilation would also be a contributing factor.
Mick"If you need a machine today and don't buy it,
tomorrow you will have paid for it and not have it."
- Henry Ford 1938
-
6th March 2008, 07:27 PM #3
G'day.
Is the whole floor cupped or just one section?
Is the Batten section cupped or the B&Joist section?
Get under the house and see if you have a wet patch or leaking pipes.Hooroo.
Regards, Trevor
Grafton
-
6th March 2008, 08:15 PM #4
200mm? Lessee... that's 20cm or around 8" Surely you meant 20mm?
The probable reason's already been mentioned and I'll hazard a guess that it's the battened section lifting...? Still, I gotta ask: How long did you store the boards in the room before laying? ie. Did you leave 'em in a stickered stack for any length of time?
- Andy Mc
-
6th March 2008, 08:22 PM #5
yes journeyman Mick thats exactally what i thought.thanks
glock40sw yes its the whole floor every board is concave,but joist and batterns are fine.
And yes i mean 200mm when icut the board out with a jigsaw the gap closed up instanly
Ill try and attach pic
-
6th March 2008, 08:44 PM #6
Heres a pic of the sub floor before the floor went down.
-
6th March 2008, 09:16 PM #7
How long has the floor been down?
How long has it been cupped?
How old is the concrete where the stirups are?
Is there a moisture membrane under the battens?
For the whole floor to be cupped with that much pressure on the boards, I'd say you have a very bad moisture problem somewhere.
Either moisture from outside is getting under the floor or you have severe pipe leakage.
Go buy a moisture meter (even a cheap one will do). test the top of a board and note the reading. then test the bottom of the same board. They should be the same give or take 1/2 to 1%. If the bottom is wetter than the top, then you do have a underfloor moisture problem and no amount of insitu climatisation will solve it.Hooroo.
Regards, Trevor
Grafton
-
6th March 2008, 09:29 PM #8
How long has the floor been down? 6 Months
How long has it been cupped? not sure say 1 month
How old is the concrete where the stirups are?
some stirups are boted to an old slab that was originally there others have been dug into soil
Is there a moisture membrane under the battens? Yes
-
6th March 2008, 11:37 PM #9
-
15th March 2008, 05:09 PM #10Floor Sander Melbourne
- Join Date
- Jul 2006
- Location
- Melbourne
- Posts
- 52
There's a big pipe running under the floor in that photo. Possibly leaking?
-
15th March 2008, 10:06 PM #11China
- Join Date
- Dec 2005
- Location
- South Australia
- Posts
- 140
As said above I'd be checking the waste pipe and install underfloor vents while your at it
Similar Threads
-
Need Timber floor advice - PLEASE help!
By tax_man in forum FLOORINGReplies: 15Last Post: 12th September 2007, 10:01 PM -
Need Timber floor advice - PLEASE help!
By tax_man in forum FLOORINGReplies: 1Last Post: 12th September 2007, 05:21 PM -
Floor finishing advice
By Eddie Jones in forum FLOORINGReplies: 8Last Post: 9th February 2007, 04:13 PM -
advice on floor laminates
By kufu in forum FLOORINGReplies: 0Last Post: 1st February 2005, 09:28 AM
Bookmarks