Blanke Permat Tile Underlayment 6.5 sq ft Single Sheets

5 Reviews
SKU: 527-904-US
Available in CT Warehouse More Info
Available in UT Warehouse More Info

Product Details

Product Details

Blanke Permat Tile Underlayment 6.5 sq. ft. Single Sheet

Innovative uncoupling underlayment that offers all the labor saving benefits of the old plastic roll systems. Blanke PERMAT also adds support to wood substrates thereby reducing deflection and provides greater compression and tensile strength than plastic roll products. The Blanke PERMAT is stable to walk on during installation and does not require additional curing time when installing porcelain with latex modified thinset.


  • 1/8" thick
  • Dimension 6.5 sq ft and measures 2 ft x 3.2 ft.
  • No extended cure time for latex modified thinset mortars under porcelain tile
  • Crack isolation properties (uncoupling)
  • Permanent Support of high quality flooring, stone, marble
  • Reduces vertical sub-floor movement (deflection)
  • Interior use only
  • Adds the extra substrate support for stone floor installation (max L/720 for stone vs L/360 for tile)
  • Approved for ceramic tile installation over layer of 3/4" plywood on 24" o. c. joist spacing
  • 10 years replacement warranty against problems caused by excess deflection only warranty of its kind in the industry (see permat warranty for details)
  • Superior compressible strength
  • Strengthens wood substrates thereby reducing deflection
  • Superior tensile strength
  • Crack isolation properties (uncoupling)
  • Superior resistance to delaminating during installation
  • No extended cure time for latex modified thinset mortars under porcelain tile
  • Lightweight; easy to install
  • Self-seaming panels prevent substrate movement stress form transmitting to tiled surface

Instructions for Installing Permat

  • Substrate must be clean, dry, flat and load bearing
  • Trowel a more liquid than normal mix of thinset mortar onto substrate
  • Lay the Blanke PERMAT panels in a row so that the mesh overhang on the two sides of a panel cover the seams of the sides of adjacent panels without the overhang
  • Subsequent rows of panels should be placed so that the seams running perpendicular to the previous row are offset a minimum of 3" from the seams running in the same direction in the previous row
  • Use the flat side of a trowel or a vinyl roller to press the panel into the thinset ensuring that the fabric on the underside of the panel achieves full contact with the thinset and that there are no air bubbles
  • Use the flat side of the trowel to key thinset into the voids on top of the Blanke PERMAT
  • Set tile using a notch trowel appropriate for the type of tile and traffic. (Read Blanke PERMAT Installation Instruction prior to installing this product)
  • Movement joints are required in the tile surface per industry standards

Typical Applications

  • Ideal alternative to backer board underlayment used in interior residential applications over wood substrates where excess deflection may be an issue and in commercial applications on concrete where stress cracks can be a problem
  • Blanke PERMAT is ideally suited for new home construction where demanding installation schedules cause traffic to cross on the underlayment prior to tile installation

Suitable Substrates

  • Wood substrates stone and tile (including large format) Plywood EGP and OSB 16" o.c. joist spacing, minimum subfloor thickness: 5/8" 19.2" o.c. joist spacing, minimum subfloor thickness: 3/4"
  • Wood substrates tile only (no larger than16"x16") 24" o.c. joist spacing, minimum subfloor thickness: 3/4" (subject to maximum joist span restrictions)
  • Concrete substrates Substrates covered with stone, tile and vinyl (consult thinset manufacturer instructions) Floor heating systems (consult Blanke installation instructions)

Technical Data

  • Top Mesh: Extruded twisted strands of highly alkali resistant glass fiber, heat welded to the lower layer of HDPE mesh
  • Bottom Mesh: Extruded twisted strands of alkali resistant high-density polyethylene (HDPE)
  • Fabric material: Polypropylene fleece
  • Thickness: approx. 3.3 mm (nominal 1/8 inch)
  • Weight: approx. 0.8 kg/m2 (approx. 2.6 ounces/sq. ft): 1.06 lbs. per - panel: 31.8 lbs. per carton
  • Color: Fabric: white HDPE Mesh: light-blue Top Mesh: dark blue
Questions & Answers
6 questions

Can I use the Blanke Permat on outdoor applications?

The Blanke Permat uncoupling sheet is not rated for outdoor use.

When using Permat by Blanke is there a particular thinset I should use when installing porcelain?

Latex modified thinset is recommended for porcelain tile installation. Using the Blanke Permat does not extend cure times for the mortar under the tile.

Can I use the Permat over an existing concrete floor?

Yes, be sure to use a modified thinset mortar when installing this product. Permat is suitable substrate for going over concrete slabs.

Are there issues that I should know about setting the Blanke Permat over or below floor warming cable or mats?

Heating system should be installed first then permat. This does not impede the ability to warm the floors. The testing data showed that it took a few seconds to reach target temperature but it also took less energy to maintain the temperature: a wash! Blanke recommends that you bond tile or stone directly to Permat. The strength of Permat ( increase in Point load, compressive, sheer, and tensile) begins to diminish once you get over 3/8 inch between Permat and tile or stone. If the floor is more than 3/8 out of level Blanke suggests you level first.

Can permat be installed over vinyl floors?

Yes the Blanke Permat can be installed over vinyl however please follow all recommended guidelines with the thin set you are using.

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Ratings & Reviews

5 reviews

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1/16/2019 10:42 pm

Very easy to work with

by Adam G.

On previous jobs, I've used cement board, and I've used the rolls of plastic underlayment from another brand, but this is far easier in the sheet form it comes in. Permat was as thin as any other option, but it adds strength to bond everything together like no other product I've seen. It was worth the expense for the small job I had.

1/4/2023 4:43 pm

Excellent service and reasonably priced items

by Phil C.

I needed enough Blanke Permat sheets to complete a medium size bathroom floor. Contractors Direct provided the Blanke Permat sheets at a reasonable price and with reasonable shipping charges. The items arrived within a week. I will definitely use Contractors Direct for my future orders.

3/7/2023 8:42 pm

Great underlayment

by Scott

These are perfect for adding the strength that the substructure needs. I've found Blanke Permat helpful for installing stone tile without having to add another layer of plywood. Easy to install and I've used this product for years.

9/14/2023 2:20 pm

Fast Delivery; Excellent product for tile substrate

by Jim -

Great product. Very easy to use and much stiffer than Schlueter. I used this because small mosaic tile isn't allowed on Schlueter. Pricey but nice and easy to used. Install tile right after laying underlayment without waiting. Delivery was fast. No problems

5/14/2024 1:27 pm

Awesome underlayment

by Aaron hayes

Love the ease of use. Easy to cut with decent scissors. Straight forward installation process. I consider it a must buy when installing stone over wood substrate.