Can I use modified thinset over Hardibacker?

Can I use modified thinset over Hardibacker?

Do not align HardieBacker cement board joints with plywood joints. Apply a supporting bed of dry-set mortar or modified thinset to plywood with a 1/4 in square-notched trowel. Mastic can also be used with a 5/32 in V-notched trowel.

Is it necessary to use thinset under Hardibacker?

Not only is thinset a critical component underneath cement board but the other critical component is the fasteners. And you won’t have the fasteners if you are trying to install it over concrete.

Do you use modified or unmodified thinset for cement board?

Therefore, it’s best to use unmodified thinset when working with an impervious installation membrane like Prodeso for installing radiant floor heating. It’s important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious.

What is the difference between modified thinset and unmodified thinset?

Unmodified thinset has been around forever. Unlike unmodified mortar, which consists only of a blend of Portland cement, sand, and water retention agents, modified thinset includes additional retention products, such as latex polymers, which can increase its performance and strength.

Can I put thinset on plywood?

Use Thinset With a Higher Latex Content Thinset is the wet base that you first trowel on the plywood to make the tile stick. Higher latex content is essential for bonding to plywood. A quality unmodified thinset should be used and mixed with a latex additive.

How big of a thinset do I need for hardibacker?

This is probably because at one time the installation instructions for Hardibacker called for 3/32″ inch of thinset underneath. Currently, Hardibacker calls for either 1/4″ thinset , or 5/32″ mastic underneath .

Which is the best thinset to use for backer board?

Backer board:For backer board on floors, specifically cement board and fiber cement boards (think Hardibacker), it’s my understanding that it doesn’t matter which thinset you use. The thinset doesn’t need to bond to the plywood. Instead it’s part of a system with the fasteners. The nails or screws hold it down and the thinset holds it up.

What kind of thinset to use between cement and Hardi?

An unmodified thinset (Masterblend) is fine between the Hardi and the subfloor. The reason for the layer of thinset between the cement board and the subfloor is to fill the voids/gaps between the two. It’ll keep the cement board from moving up and down. That long term flexing can lead to problems down the road.

What’s the difference between unmodified thinset and modified thinset?

The type you choose will depend on your project and how much strength and flexibility you will need. The main difference between modified and unmodified thinset is that the modified version contains special polymers to increase strength and flexibility. When you mix mortar with water, it begins to harden.

What is the best thinset for backer board?

Laticrete 254 Platinum is one example of this. Make sure you read the instructions on the bag. These mortars really are the best thinset of the bunch because they have to be. Plywood: For going over plywood with products like Ditra or any other membrane the thinset will have to have an ANSI 118.11 rating on it.

Do I need thinset under Hardibacker?

It will make an enormous mess under the house (or whatever is under your bathroom). It is also more likely to make the floor uneven since it is hard to level thinset that is separated by gaps. The installation manual for HardieBacker suggests to embed it in thin-set and it should be installed over plywood.

How important is thinset under Hardibacker?

Can I use unmodified thinset on plywood?

Do I have to put thinset under Hardibacker?

Do I need vapor barrier behind Hardibacker?

Hardibacker doesn’t need a vapor barrier or waterproofing except you do need to tape and thinset the joints.

Can I just screw down cement board?

Screw and Joints Do not use drywall screws as they are not recommended to be used to hold the backer board in place. All of your backer board pieces should be cut before they are placed on​ the floor. It is important to highlight that screws shall not be installed all the way down to the floor joists.

Which is better durock or Hardibacker?

Durock is too abrasive and can damage vinyl, porcelain, and enamel. HardieBacker does not contain any course materials, so it is the preferable choice. It has a warranty that extends over the use of vinyl tile applications. Durock does not.

Backer board:For backer board on floors, specifically cement board and fiber cement boards (think Hardibacker), it’s my understanding that it doesn’t matter which thinset you use. The thinset doesn’t need to bond to the plywood. Instead it’s part of a system with the fasteners.

What’s the difference between unmodified and modified thinset?

If there wasn’t enough moisture, the thinset wouldn’t be strong enough to bond the tile to the subfloor. Unmodified thinset consists simply of cement, finely graded sand and water retention agents. It’s mixed with water before it’s ready to be spread out on the subfloor.

What can I use multiset modified thinset mortar for?

MultiSet Modified Thinset Mortar can be used to set porcelain tile under a wood stone. For further assistance please contact us at 1 800 282 8786 option 2. Does this mortar work when you lay ditra on it? We would suggest contacting Schluter-Ditra to ensure MultiSet Modified Thinset Mortar will comply with their systems warranty.