do you need plywood behind hardie board
Edwardh1 May 14 2003 0859pm 2. It is completely okay if you were not aware that theres no sheathing under siding until you removed it.
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Be sure that the siding installed is dry.
. You CAN put hardi directly on studs without sheathing but you need to use let-in bracing to give structural rigidity to the walls. In compliance with the tile industry James Hardie recommends 1-14 long galvanized or stainless steel roofing nails 0121 shank x 38 HD or 1-14 long corrosion resistant ribbed waferhead screws No. Now we have got the complete detailed explanation and answer for everyone who is interested.
However if this is a one story bungalow with shiplapped interior and has relatively little wind exposure putting the siding right on the studs should not be a problem. Some people might place a piece of wood behind the board to provide extra support while others might place a piece of metal or plastic to help reduce vibration and noise. Which type of thinset do I need for underneath the cement board installation.
Does hardie board need to be primed. The most common sheathing materials include oriented strand board and plywood. Fiber cement siding should be installed over plywood OSB or sheathing.
Myself I would not consider using the siding without sheathing but thats your decision. You do NOT want a vapor barrier of any kind on the exterior side of the studs even in unheated space or the wood will likely accumulate moisture rot. However you can always add sheathings if you wish.
Yes the old wood siding offered racking strength and ideally plywood or OSB would be used under the fiber-cement. Fiber cement siding should be installed over plywood OSB or sheathing. James Hardie recommends that a slip sheet joint flashing is installed behind each butt joint in the siding.
Noplywood is not necessary behind hardie board. This is a question our experts keep getting from time to time. So plywood definitely makes a good underlayment for the Hardie board siding but it is certainly not the only option.
Fiber cement siding shall have a 18 gap between trims of windows and doors. 8-18 x 38 HD. If you need to cut cement siding a 100 acrylic latex primer must be used to reseal the surface.
Water will run down from this sill absorb into the siding get behind into the sheathing and possibly the frame causing all. When considering plywood for sheathing builders choose from 12-inch CDX common. Absolutely right sorry.
This is a 6 wide piece of weather resistive material to make sure that no water gets through. What type of fastener do you recommend for floor and wall applications of HardieBacker cement board. In unheated space that isnt likely to be super-tight in moderate-temp winter environments like Seattle you probably dont need to go hog-wild with vapor retarders on the interior either.
Its possible that it was not added to the construction plan. Many people prefer OSB over plywood due to its shear values. Missing sheathing is not any structural defect.
There is no one answer to this question as it depends on the specific use for the Hardie board. When you are getting close to the final grade leave at least 6 between the bottom of the siding and finish grade and a minimum of 1 ½ above rooflines and decks. Fiber cement siding is a hard brittle product.
And either way you should use a barrier like tarpaper or Tyvek underneath it. What Do You Put Behind Hardie Board. Otherwise it might shrink at butt joints.
Do you have to mortar under cement board. Do you need plywood behind hardie board. As James Hardie recommended the fibre cement siding can be installed over steel studs or braced wood or it can be installed directly over OSB plywood or sheathing.
Heres the bit of good news. One of the worst problems with Hardie siding is moisture damaged which can be caused by cracking. Do you need plywood behind Hardie board.
Sheathing works as a case or cover structural support insulator and more.
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