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Dear GGAUGHAN:
Straight from the Mapei literature... "KERALASTIC is freeze/thaw stable down
to temperatures of -18°C. However, it is
wise to protect all water-based products from
prolonged exposure to deep freezing. If frozen,
do not stir until material has completely thawed."
As for the KERABOND I cannot be so sure. It would not be recommended. The recommendation is to not even use it at temperatures below 40°F (4°C). It is not so forgiving.
If you decide to go ahead, at the very least, mix up a batch (dry mix beforehand) and do a test adhesion of a tile, allow 48hours and test just how well it adheres... to be acceptable, you should not be able to pry it off.... not without breaking the tile.
WARNING
Although the technical details and
recommendations contained in this
product report correspond to the best
of our knowledge and experience, all
the above information must, in every
case, be taken as merely indicative
and subject to confirmation after
long-term practical applications: for
this reason, anyone who intends to
use the product must ensure
beforehand that it is suitable for the
envisaged application; in every case
the user alone is fully responsible for
any consequences deriving From the
use of the product.
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Dear BOBCO:
No, I haven't.... that's a new one for sure. Oh, your question being, "will this work"? Heated Floors - Radiant heating is one of the fastest growing market segments in the construction industry. Unlike other surface coverings, the low thermal resistivity of ceramic and stone tiles allows them to be used in radiant heat applications without sacrificing the energy efficiency of the system. However, there are inherent challenges in combining rigid surface coverings with radiant panel heating systems. A viable installation system must address the magnified fluctuations in temperature that contribute to increased shear stresses between the heated assembly and the tile covering. The system must also limit thermal striping by promoting even heat distribution and protect the assembly from moisture, which is particularly important when gypsum concrete is used as the thermal mass.
Differential movement stresses are magnified in radiant-heated floor applications because of significant temperature gradients. Schluter®-DITRA's uncoupling function protects the ceramic or stone tile covering by neutralizing the differential movement stresses between the heated assembly and the tile, thus eliminating the major cause of cracking and delaminating of the tiled surface.
Schluter®-DITRA's waterproofing function provides simple, effective, and permanent protection for moisture-sensitive substrates, such as gypsum concrete and wood, used in heated floor applications.
The open rib structure of the Schluter®-DITRA matting allows the residual moisture in the substrate to escape. This is particularly important for gypsum concrete since it must dry in order to gain strength. In addition, the free space beneath the matting limits thermal striping by promoting even heat distribution throughout the assembly.
Industry standard guidelines referencing uncoupling membranes over heated floors include methods RH111 and RH112 in the Tile Council of North America (TCNA) Handbook for Ceramic Tile Installation .
Exterior Applications
Ceramic and stone tiles are ideal surface coverings for the exterior and have been used successfully for thousands of years. Exterior balconies and terraces are ideal opportunities for the installation of tiled surfaces. However, these installations have typically presented significant challenges to tile setters. Since hard surface coverings are rigid by nature and have different physical properties compared to virtually every substrate, they cannot be bonded directly to the substrate, particularly in exterior applications where they are exposed to potentially severe climatic changes and the recurring introduction of moisture.
Schluter®-DITRA's uncoupling function protects the ceramic or stone tile covering by neutralizing the differential movement stresses between the substrate and the tile, thus eliminating the major cause of cracking and delaminating of the tiled surface. This is particularly important since these stresses are magnified by the significant temperature gradients common in exterior applications.
Schluter®-DITRA provides effective waterproofing that will protect the tile assembly from the recurring introduction of water which is common in exterior applications.
The free space beneath Schluter®-DITRA's matting provides a route for any residual moisture in the substrate to escape. This is especially important when installing tile over a young slab, a concrete slab subject to moisture migration, or a fresh mortar bed.
Since Schluter®-DITRA is virtually incompressible within the tile assembly, the advantages of uncoupling are achieved without sacrificing point load distribution capabilities.
How do Warmboard panels hold up during construction?
Warmboard panels are rated Exposure 1, as specified by the APA – The Engineered Wood Association. The APA trademark is the consumer’s assurance that products, which bear its stamp, have met specific manufacturing and product performance standards.
As an APA approved product, Warmboard panels can handle exposure to rain, snow, and ice. In fact, the aluminum top surface of Warmboard acts as a ‘built in’ weather barrier making it even more impervious to rain and snow than standard Exposure 1 plywood. During construction Warmboard panels can be walked on, bracing can be nailed off and sill plates can be nailed directly to them. In general, Warmboard Radiant Subfloor should be treated in the same manner as any other plywood subfloor.
It should be noted that it is normal for plywood to experience minor amounts of bowing, due to humidity swings (especially during shipment). However, the panels will lay flat when they are fastened down over the joists and secured with construction adhesive and common nails, ring-shank nails, or screws per the installation instructions. APA standards also require 1/8 inch gapping on the 4-foot side of all subfloor panels, including Warmboard panels, to compensate for changes in moisture of the engineered plywood. The 8-foot side of Warmboard panels are pre-gapped tongue and groove.
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ggaughan
