QUESTIONSealant/Caulking for Tile next to Woodstove - Need to use AccuColor sanded siliconized acrylic latex caulk around tiles being installed near a woodstove. Wanted to know if it can withstand high temperatures after application. The areas exposed to heat will only be about 120 degrees max. probably. Nothing was mentioned on caulk tube about temps it could withstand. Only mentioned temps in regards to when product is applied. Thank-you
ANSWERANSWER - AccuColor sanded siliconized acrylic latex caulk does not meet industry standard ASTM C920, per TCNA EJ171 Movement Joints, and should not be used in tile or stone installations. It is commonly used in tile and stone installations because it is easier for the installer to use and less expensive. The Siliconized latex sealant caulkings do not last long and do not perform well.
You should be using an ASTM C920 sealant such as a silicone or urethane type which perform substantially better. Some are more heat and weather resistant than others. Check with the sealant manufacture to determine which product you should use. Building Supply stores normally stock this type of material of the home centers stock the silicone type. If you want to paint the sealant and you use silicone be sure to get the paintable type because most silicones can't be painted. Some of the manufacturers of these types of sealants are Dow Corning, GE, Degussa, Sika, Laticrete Lataseal, and others.