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Tile backer

Posted by JT on March 25th, 1999 07:46 PM
In reply to den-shield, durock, gypsum, mortar, and cement by Marietta on March 24th, 1999 08:46 PM [Go to top of thread]

5 of 5 people found this post helpful

Marietta, basicly your options fall into three
catagories: motar bed, tile backer, other (eg.
plywood). A mortar bed is the most expensive, and
most would agree, the best. The most commonly used types
of tile backer bd. are: cement bd. (Durock is one of
many brands), Hardibacker, and Den-Shield.

Cement bd. is composed of cement and fiberglass, is
manufactured to meet or excede ANSI A-119.9 specifiation,
and is recognised by the TCA (Tile Council of America).
It is impervious to water, but not water proof,
and available in 1/4", 1/2", and 5/8" thicknesses.

Hardibacker is a proprietary composition of cement,
sand, and cellulose fiber. It is available only in
1/4". While not recognised by the TCA, it is recognised
by several building codes. It has not been around
as long as cement bd.

Dens-Shield is genericly referred to as glass mat
water resistant gypsum backer bd. (it bears no relation
to other types gypsum board such as green board),
and is recognised by the TCA. It is impervious to water,
and waterproof. Additionally, it doesn't wick water the
way cement board does. It is available in the same
thicknesses as cement bd. You can find more details at:

All of these backers bd's are non-structural and require
their sub-flooring to meet certain minimum spec's. When
properly installed, all give good service.

When you talk about waterproofing, there are various
degrees, and you should tailor the installation to
the expected usage. All of the backers can be waterproofed
(though not to the degree of a shower pan); the
advantage of Dens-Shield is that you only have to
worry about the seams and edges.

You can get a TCA Handbook at for
$3 which shows many proven installations methods.

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  • WOW by Mariett  3/27/99 01:41 AM

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