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How much will new timber skirtings shrink?
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Lobster
Nov 22, 2012, 4:16:52 PM11/22/12
to
I need to replace a long length of skirting board (3.8m long to be
precise) and I'm concerned how much it may shrink having been
transferred from the timber yard (ie under cover but open to the outside
air) into my centrally heated house. Is there a rule of thumb for %
shrinkage and/or how long it will take to equilibrate?
SWMBO's organised a decorator (spit) to come in next Monday, and I only
bought the skirting and brought it in the house this morning - does te
panel reckon I will be OK fitting it on Sunday?
Thanks
David
precise) and I'm concerned how much it may shrink having been
transferred from the timber yard (ie under cover but open to the outside
air) into my centrally heated house. Is there a rule of thumb for %
shrinkage and/or how long it will take to equilibrate?
SWMBO's organised a decorator (spit) to come in next Monday, and I only
bought the skirting and brought it in the house this morning - does te
panel reckon I will be OK fitting it on Sunday?
Thanks
David
Jim K
Nov 22, 2012, 4:18:49 PM11/22/12
to
Jim K
newshound
Nov 22, 2012, 4:58:34 PM11/22/12
to
eights into good brickwork or blockwork every half metre?) will this
prevent it from moving? Same principle as used for continuous welded
rail, the friction at the shoes resists any tendency to expand/contract
with temperature changes.
--
For every complex problem, there is a solution which is simple, neat,
and wrong.
H L Menken
Cash
Nov 22, 2012, 5:12:46 PM11/22/12
to
Lobster wrote:
> I need to replace a long length of skirting board (3.8m long to be
> precise) and I'm concerned how much it may shrink having been
> transferred from the timber yard (ie under cover but open to the
> outside air) into my centrally heated house. Is there a rule of
> thumb for % shrinkage and/or how long it will take to equilibrate?
It won't shrink in its length - but it will shrink in its width ("sometimes"
> I need to replace a long length of skirting board (3.8m long to be
> precise) and I'm concerned how much it may shrink having been
> transferred from the timber yard (ie under cover but open to the
> outside air) into my centrally heated house. Is there a rule of
> thumb for % shrinkage and/or how long it will take to equilibrate?
quite a lot, but you should expect a few millimeters) over a period of time.
> SWMBO's organised a decorator (spit) to come in next Monday, and I
> only bought the skirting and brought it in the house this morning -
> does te panel reckon I will be OK fitting it on Sunday?
notice any difference until the next time you redecorate.
Cash
John Rumm
Nov 23, 2012, 12:32:56 AM11/23/12
to
On 22/11/2012 21:16, Lobster wrote:
> I need to replace a long length of skirting board (3.8m long to be
> precise) and I'm concerned how much it may shrink having been
> transferred from the timber yard (ie under cover but open to the outside
> air) into my centrally heated house. Is there a rule of thumb for %
> shrinkage and/or how long it will take to equilibrate?
Most of the shrinkage should be across the grain, so not too much of a
> I need to replace a long length of skirting board (3.8m long to be
> precise) and I'm concerned how much it may shrink having been
> transferred from the timber yard (ie under cover but open to the outside
> air) into my centrally heated house. Is there a rule of thumb for %
> shrinkage and/or how long it will take to equilibrate?
problem with skirtings.
--
Cheers,
John.
/=================================================================\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\=================================================================/
meow...@care2.com
Nov 23, 2012, 2:57:14 AM11/23/12
to
If you need to move quicker, the higher up the fixings go the less the top will move. I'm not suggesting taking this too far though :)
NT
Dave Liquorice
Nov 23, 2012, 3:14:18 AM11/23/12
to
On Thu, 22 Nov 2012 21:58:34 +0000, newshound wrote:
> If it is fixed fairly securely (say, a couple of three inch number
> eights into good brickwork or blockwork every half metre?) will this
> prevent it from moving? Same principle as used for continuous welded
> rail, the friction at the shoes resists any tendency to expand/contract
> with temperature changes.
That'll be why tracks buckle if there isn't enough gap left between the
> If it is fixed fairly securely (say, a couple of three inch number
> eights into good brickwork or blockwork every half metre?) will this
> prevent it from moving? Same principle as used for continuous welded
> rail, the friction at the shoes resists any tendency to expand/contract
> with temperature changes.
rail ends at each fish plate joint then. And why welded track has a long
tapered, sliding, overlaps to allow the track to move.
Do not under estimate the forces involved with expansion.
As others have said most of the movement in timber will be across the
grain not along the length but of course the timber may still cup, warp
or twist as it dries...
--
Cheers
Dave.
harry
Nov 23, 2012, 3:48:54 AM11/23/12
to
On Nov 22, 9:16 pm, Lobster <davidlobsterpot...@hotmail.com> wrote:
It depends on how much moisture is in them presently, also how they
have been cut, what part of the tree and how they were dried in the
first place.
Best to leave them for a couple of weeks at least indoors to let most
of the shrinkage take place before installation.
Tim Watts
Nov 23, 2012, 3:51:07 AM11/23/12
to
Dave Liquorice wrote:
> On Thu, 22 Nov 2012 21:58:34 +0000, newshound wrote:
>
>
>> If it is fixed fairly securely (say, a couple of three inch number
>> eights into good brickwork or blockwork every half metre?) will this
>> prevent it from moving? Same principle as used for continuous welded
>> rail, the friction at the shoes resists any tendency to expand/contract
>> with temperature changes.
>
> That'll be why tracks buckle if there isn't enough gap left between the
> rail ends at each fish plate joint then. And why welded track has a long
> tapered, sliding, overlaps to allow the track to move.
And CWR (continuous welded rail) is usually stretched as it is clipped in
> On Thu, 22 Nov 2012 21:58:34 +0000, newshound wrote:
>
>
>> If it is fixed fairly securely (say, a couple of three inch number
>> eights into good brickwork or blockwork every half metre?) will this
>> prevent it from moving? Same principle as used for continuous welded
>> rail, the friction at the shoes resists any tendency to expand/contract
>> with temperature changes.
>
> That'll be why tracks buckle if there isn't enough gap left between the
> rail ends at each fish plate joint then. And why welded track has a long
> tapered, sliding, overlaps to allow the track to move.
tobuild in some "free" expansion potential.
> Do not under estimate the forces involved with expansion.
>
> As others have said most of the movement in timber will be across the
> grain not along the length but of course the timber may still cup, warp
> or twist as it dries...
>
--
"A fanatic is one who can't change his mind and won't change the subject."
polygonum
Nov 23, 2012, 3:52:54 AM11/23/12
to
On 23/11/2012 08:51, Tim Watts wrote:
<>
>
> And CWR (continuous welded rail) is usually stretched as it is
> clipped in tobuild in some "free" expansion potential.
>
With the applied tension depending on the temperature on the day it is
<>
>
> And CWR (continuous welded rail) is usually stretched as it is
> clipped in tobuild in some "free" expansion potential.
>
installed.
--
Rod
harry
Nov 23, 2012, 3:55:01 AM11/23/12
to
On Nov 22, 9:16 pm, Lobster <davidlobsterpot...@hotmail.com> wrote:
About 50% extra cost.
sm_jamieson
Nov 23, 2012, 4:01:46 AM11/23/12
to
MDF skirting is cheap, but some long lengths at work have had the joints open up, so I guess it can shrink also.
Simon.
Lobster
Nov 23, 2012, 6:37:47 AM11/23/12
to
On 23/11/2012 05:32, John Rumm wrote:
> On 22/11/2012 21:16, Lobster wrote:
>> I need to replace a long length of skirting board (3.8m long to be
>> precise) and I'm concerned how much it may shrink having been
>> transferred from the timber yard (ie under cover but open to the outside
>> air) into my centrally heated house. Is there a rule of thumb for %
>> shrinkage and/or how long it will take to equilibrate?
>
> Most of the shrinkage should be across the grain, so not too much of a
> problem with skirtings.
Good to know, thanks! Actually that ties in with a slatted door I have
> On 22/11/2012 21:16, Lobster wrote:
>> I need to replace a long length of skirting board (3.8m long to be
>> precise) and I'm concerned how much it may shrink having been
>> transferred from the timber yard (ie under cover but open to the outside
>> air) into my centrally heated house. Is there a rule of thumb for %
>> shrinkage and/or how long it will take to equilibrate?
>
> Most of the shrinkage should be across the grain, so not too much of a
> problem with skirtings.
here, built on-site by a joiner using fresh timber: it quickly developed
see-through gaps of about 4mm between each 'plank' :(
David
stuart noble
Nov 23, 2012, 6:44:54 AM11/23/12
to
content to be precise. About 3% IME but might be dropping from 17% mc to
zero in the worst case scenario.
RobertL
Nov 23, 2012, 11:36:30 AM11/23/12
to
On Thursday, November 22, 2012 9:16:14 PM UTC, Lobster wrote:
> I need to replace a long length of skirting board (3.8m long to be precise) and I'm concerned how much it may shrink having been transferred from the timber yard
IME It will shrink across the grain; the length will be pretty much unaffected. In my case the skirting now has a 5mm gap where it meets the floor :-(
Have you considered letting the decorator do his stuff with the skirting off. you can then add it on top of the decorated wall in a few weeks once it has shrunk.
Robert
SteveW
Nov 23, 2012, 6:52:44 PM11/23/12
to
On 23/11/2012 08:14, Dave Liquorice wrote:
> On Thu, 22 Nov 2012 21:58:34 +0000, newshound wrote:
>
>
>> If it is fixed fairly securely (say, a couple of three inch number
>> eights into good brickwork or blockwork every half metre?) will this
>> prevent it from moving? Same principle as used for continuous welded
>> rail, the friction at the shoes resists any tendency to expand/contract
>> with temperature changes.
>
> That'll be why tracks buckle if there isn't enough gap left between the
> rail ends at each fish plate joint then. And why welded track has a long
> tapered, sliding, overlaps to allow the track to move.
>
> Do not under estimate the forces involved with expansion.
In my school days, we had a device in Physics, consisting of a cast base
> On Thu, 22 Nov 2012 21:58:34 +0000, newshound wrote:
>
>
>> If it is fixed fairly securely (say, a couple of three inch number
>> eights into good brickwork or blockwork every half metre?) will this
>> prevent it from moving? Same principle as used for continuous welded
>> rail, the friction at the shoes resists any tendency to expand/contract
>> with temperature changes.
>
> That'll be why tracks buckle if there isn't enough gap left between the
> rail ends at each fish plate joint then. And why welded track has a long
> tapered, sliding, overlaps to allow the track to move.
>
> Do not under estimate the forces involved with expansion.
with vertical forks at each end, a large metal bar with a hole through
it passing through both forks and a nut on a thread at one end of the
bar. The bar was heated to expand it, a bolt put through the hole and
the nut tightened so that the bar was in tension between the bolt
pressing against one fork and the nut against the other. The teacher
would then carry on with the lesson and as the bar cooled and the rod
contracted, the bolt would be snapped, with a loud bang.
SteveW
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