Question About Expansion - Flooring - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 10-15-2012, 11:37 AM   #1
Newbie
 
Join Date: Sep 2012
Posts: 11
Rewards Points: 10
Default

question about expansion


i have always been told to leave expansion gap between the flooring and the wall for the perimeter flooring to expand and contract. if the perimeter flooring expands with changes in temp and humidity, why doesnt the field tile or the field wood flooring expand and contract so as to break the mortar or bulge between two boards?

Advertisement


Last edited by gps4; 10-15-2012 at 04:04 PM.
gps4 is offline   Reply With Quote
Old 10-15-2012, 08:02 PM   #2
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 500
Default

question about expansion


not just the perimeter flooring expands...the whole floor expands therefore you need room at the perimeter to prevent buckling of the floor

Advertisement

techpappy is offline   Reply With Quote
Old 10-17-2012, 10:01 AM   #3
Newbie
 
Join Date: Sep 2012
Posts: 11
Rewards Points: 10
Default

question about expansion


my engineered flooring is glued down. the boards in the middle are surrounded on all sides. if two boards in the middle expand, why dont the buckle at the seems?

same question for tiled floors. how come expansion of the middle of the floor tile dont damage the grout between them ?
gps4 is offline   Reply With Quote
Old 10-17-2012, 11:04 AM   #4
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 500
Default

question about expansion


sorry, I was addressing the normal practice of installing a floating floor such as click lock laminate..which is not glued down and will expand and contract..I have never installed engineered hardwood flooring so, not sure about that.

Are you sure you should have glued the flooring down..check the manufacturer's installation directions..I'm doubtful they would call for glue. Of course tiles are glued and manufactured from totally different materials so will not expand noticeably.

OK I just googled it. With glued down flooring you still need to allow only a 1.5 mm gap for expansion where it meets walls or transitions etc. That is a very small distance so, shouldn't be a problem. I can only assume that the upper layers of the wood can still expand a little thus, need the room specified. There are 2.54 cm per inch so, 1.5 mm = 0.059 inches. Don't even know why they ask for it. I doubt anyone would install flooring without leaving at least that much of a gap. So, I wouldn't worry about it.

Last edited by techpappy; 10-17-2012 at 11:27 AM.
techpappy is offline   Reply With Quote
Old 10-17-2012, 11:28 AM   #5
Newbie
 
Join Date: Sep 2012
Posts: 11
Rewards Points: 10
Default

question about expansion


yes, its glued to concrete slab following manufacturer's instructions and specifications. everythingi see and read about installation calls for space for expansion around the perimeter, which got me to thinking if the perimeter expands and contracts, why doesnt the middle do the same? and if it does the same, why doesnt it cause damage that the expansion space is supposed to prevent?
gps4 is offline   Reply With Quote
Old 10-17-2012, 11:35 AM   #6
Member
 
Join Date: May 2012
Location: Sarasota,Florida
Posts: 1,630
Rewards Points: 1,158
Default

question about expansion


Quote:
Originally Posted by gps4 View Post
yes, its glued to concrete slab following manufacturer's instructions and specifications. everythingi see and read about installation calls for space for expansion around the perimeter, which got me to thinking if the perimeter expands and contracts, why doesnt the middle do the same? and if it does the same, why doesnt it cause damage that the expansion space is supposed to prevent?



It all expands at the same rate,not just the perimeter,but where else would you leave room for it to expand if not the perimeter???
Canarywood1 is offline   Reply With Quote
Old 10-17-2012, 11:36 AM   #7
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 500
Default

question about expansion


I still think it's just the top portion of all the boards that will expand a total of only about 1.5 mm which is negligible. They just don't want anyone to butt it really tight up to any immovable objects such as concrete walls.
techpappy is offline   Reply With Quote
Old 10-17-2012, 11:42 AM   #8
Newbie
 
Join Date: Sep 2012
Posts: 11
Rewards Points: 10
Default

question about expansion


Quote:
Originally Posted by Canarywood1 View Post
It all expands at the same rate,not just the perimeter,but where else would you leave room for it to expand if not the perimeter???

say the floor is tiled and all the tile expand at the same rate, wouldnt that mean that tile that is surounded on all four sides would expand and damage the grout between the expanding tile?

or suppose the floor is glued tongue and grove engineered wood flooring. the interior flooring is glued so that they will not move left or right, forwar dor backward. if the flooring expands, why doesnt it damage the tongue and groove joint?
gps4 is offline   Reply With Quote
Old 10-17-2012, 12:14 PM   #9
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 500
Default

question about expansion


While washing the dishes I suddenly realized we may be looking in the wrong direction. If tight against walls etc., the walls will also expand and contract depending on relative humidity therefore could pinch in on the flooring causing distortions/buckling.


BTW is allowing the 0.059 inches or 1.5 mm a problem and why?
techpappy is offline   Reply With Quote
Old 10-17-2012, 12:22 PM   #10
Newbie
 
Join Date: Sep 2012
Posts: 11
Rewards Points: 10
Default

question about expansion


no, its not a problem and i try to leave space between the flooring and the walls. it just occurred to me that if the perimeter does in fact expand and contract with humidity and tmeperature, wouldnt the field tile/engineered flooring in the middle of the floor also do the same?
gps4 is offline   Reply With Quote
Old 10-17-2012, 01:19 PM   #11
Member
 
GBrackins's Avatar
 
Join Date: Apr 2012
Location: Fairhaven, Massachusetts
Posts: 2,877
Rewards Points: 2,032
Default

question about expansion


expansion ratios vary between different types of floor coverings. wood absorbs moisture and expands, when it dries it shrinks. ceramic and stone tile do not have the same expansion ratios as covering made from wood.
__________________
Gary

"You get what you pay for, and sometimes free costs more!"
GBrackins is offline   Reply With Quote
Old 10-17-2012, 03:00 PM   #12
Member
 
Join Date: May 2012
Location: Sarasota,Florida
Posts: 1,630
Rewards Points: 1,158
Default

question about expansion


Quote:
Originally Posted by gps4 View Post
no, its not a problem and i try to leave space between the flooring and the walls. it just occurred to me that if the perimeter does in fact expand and contract with humidity and tmeperature, wouldnt the field tile/engineered flooring in the middle of the floor also do the same?


Yes it would,and the most expansion occurs across the grain,and very little with the grain.
Canarywood1 is offline   Reply With Quote
Old 10-17-2012, 03:11 PM   #13
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 500
Default

question about expansion


are we there yet?
techpappy is offline   Reply With Quote
Old 10-17-2012, 04:17 PM   #14
Newbie
 
Join Date: Oct 2012
Posts: 11
Rewards Points: 10
Wink

question about expansion


Manufacturer's specify to leave a gap against base plates the thickness of the hardwood. Reason IF the wood expands near the base plate it could exert enough pressure to move the wall plate. It is a common thought that the whole floor will expand. Not necessarily! The wood will expand where the moisture is, 20 away no moisture no expansion. The wood say in the middle of the room will expand until it cannot move the boards surrounding it and then will expand off the subfloor as much as 3" to 4" in other words it will buckle off the floor as the force holding it to the concrete or wood subfloor, will no longer hold it down. Most cases I have found even flooded floors seldom close a proper gap and I have seen none that have moved the wall plate.

Advertisement

Jim Decker is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Goofy expansion joint question 614Brewer Landscaping & Lawn Care 2 06-09-2012 09:32 AM
Linoleum on concrete expansion gap question toobhed Flooring 0 03-13-2012 04:15 PM
Basement Renovation Question KUIPORNG Remodeling 234 08-26-2008 09:19 AM
Hardwood closet threshold question DIY-Renovator Flooring 1 07-27-2008 05:42 AM
Cedar siding expansion question creamaster Carpentry 7 07-20-2008 11:50 AM




Top of Page | View New Posts