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5th September 2019, 07:36 PM #1New Member
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Can I seamlessly butt-join MDF sheet without cracking?
Hi,
Hoping someone can assist me. I'm using 18mm MDF board to clad the side stringer of a stairway. Please see attached an image of a similar design.
The MDF sheet covers the face of the glass balustrade which is fixed direct to the stringer using concealed fixings. Height at the highest point from top tread to floor is 1900mm, unfortunately the largest MDF board I can buy is 1800 x 3600mm. The longer side is needed for the length of the stair which means I'm left with a small butt join just one tread or 250mm long.
It would be nice to use one complete panel instead of having to make a feature of the joins, most likely vertical.. Is there a method to butt join MDF board so it will not crack? Using edge biscuits or other? the glass balustrade prevents anything being attached to the inside surface, so all joins will need to be wholly within the material.
Many thanks.
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5th September 2019, 08:10 PM #2SENIOR MEMBER
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Maybe just me but I'm not sure where or why this mdf is required?
Russ
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5th September 2019, 08:17 PM #3GOLD MEMBER
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You can use biscuits or glue in a tongue but there is still a chance it will crack. Kitchen bulkheads were often done in MDF but they would often crack so we used to still clad them in plasterboard
Plasterboard with a set casing bead edge following your profile would be the best option for a seamless finish
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5th September 2019, 08:35 PM #4Taking a break
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There's always the risk of cracking along a join, no matter how you do it.
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5th September 2019, 09:34 PM #5GOLD MEMBER
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You can get 3600 x 1800 sheets of MDF.
Experienced in removing the tree from the furniture
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5th September 2019, 09:46 PM #6
I used to operate a commercial CNC router in a kitchen factory that used 2400 x 1800 MDF sheets as a vacuum diffuser for the bed, so larger size sheets are available, but you might not get them through Bunnings or similar. However you should be able to get them through distributors etc. I believe that they can be accessed in sizes to 3600 x 1800, as commercial CNC routers are available that can handle sheets up to that.
That being said, although you would eliminate a horizontal joint near the top tread, you would most likely end up still having a vertical joint because I doubt that you will be able to cover the entire side of the staircase with a single sheet, so the plasterboard option may be the way to go.I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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5th September 2019, 09:46 PM #7
Indeed you can. Price is the same as its sold per M2.
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Mister Ply Wood > Products > MDF
I buy from TimberWood - they are awesome. MrPly will cut to size for you.
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5th September 2019, 10:03 PM #8New Member
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5th September 2019, 10:05 PM #9New Member
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5th September 2019, 10:07 PM #10New Member
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5th September 2019, 10:10 PM #11New Member
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Thanks, 3600 is needed for stair length, 1800 width is the height. I use Mr Plywood but he can't do the jagged cut I need. I'll likely need to cut onsite.
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5th September 2019, 10:49 PM #12
How about "laminating" three layers of 6mm MDF sheets and stagger the joins to create a piece to your required dimensions ? That's the way I would do it.
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6th September 2019, 05:36 AM #13GOLD MEMBER
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6th September 2019, 06:26 AM #14rrich Guest
My thoughts are to glue a piece of MDF to strengthen the area of the joint. Hide it in the back side.
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6th September 2019, 09:14 AM #15New Member
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That's prob the best suggestion I've heard so far, it's complex but would prob work. Just a lot of work. Thanks
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Thanks but with glass lamination to the back this is not an option.
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