How To Flash A Stone Chimney On A Metal Roof
Use a high-quality masonry sealant to seal the metal to the stone. The flashing needs to be let into the chimney either at the mortar joints as its done now or a straight line cut through both stone and mortar. Drill a small hole in this spot to mark the chimneys center. When installing a chimney for a wood stove on a metal roof youll first need to assess the position.
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Chimneys and Skylights.
How to flash a stone chimney on a metal roof. Place a small drop of caulk where the roof and chimney meet at the chimney corner. Insert a Z-shaped piece of metal to connect it to the wall. Use mortar nails to secure the base flashing to the chimney.
Set the flashing aside. Fasten cleat with pancake head screws. Many roofers will surface mount chimney counter flashing by attaching a flat piece of metal to the chimney surface and apply a bead of caulk to the top edge of the flashing.
All Metal Roofing Specialists feels roofing penetrations such as chimneys and skylights present some of the most challenging flashings on a metal roof. Fasten upturned leg of the pan flashing to. I prefer to use a DSA flashing also known as a dead soft aluminum flashing.
The silicone has a shorter life than the roof. Some roofers add cement to the bottom 12 inches or so of the portion of the chimney above the roof to create a rectangular box which they can flash to. Others wrap flashing up the chimeny and fill the cavity between the flashing and the irregular stone with silicone sealant.
How to flash around a chimney on a metal roof. Install the flashing and counterflashing during construction of the chimney running the counter flashing through the rising stone and up against the chimney flue tile liner. Cut the bottom of the sidewall flashing at 45 degrees and the top such that it will bend around the uphill side of the chimney.
Posted on 03122020 by savgreenmak savgreenmak. Flash the chimney during construction -1. Some roofers or masons use the following solutions to avoid leaks around a stone chimney.
A diamond blade is pretty much a necessity as well. Screw the pan flashing to the roof with gasket screws. The chimney leak is almost certainly being caused by the flashing that needs to be integrated into the chimney and then stepcounterflashed.
Use metal screws or nails to hold the overlaps together then apply caulking material on the seams to seal them off. I have to flash a chimney where it penetrates a corrugated metal roof with ridges 8 inches oc. This flashing is super thin and very flexible to curve around the humps in the metal roofing.
A stone-and-mortar chimney has an uneven surface and it is difficult to cut into. If you use nails to hold the overlaps you should use a nail gun instead of a hammer to drive the nails into the flashing. Apply butyl tape sealant to the bottom of an offset cleat and install the cleat six inches above the chimney base.
On the sides of the chimney I did not want to see so much mortar protruding past the stones so I copied what was done previously - short step flashing contour cut up to the underside of the stones with an application of roofing cement to cover the upper edge of the step flashing no cap over the step flashing. How do you install chimney flashing on a metal roof. Fit an 8-inch 203-cm piece of square step flashing over the chimneys front corner.
Apr 29 2011. When visualizing a flashing strategy for the down-slope face of the chimney picture the plane of the roof at the top of the ridges not at the lower flat portion of the. Place the chimney where it would be related to the stove and mark the center of the chimney on the ceiling.
Bridgette that type of chimney is a bit difficult to flash as a retrofit but the best approach is to cut a vertical slot called a reglet a couple of inches from the back of the chimney and at least an inch deep. Place the step flashing over the caulk and onto the chimney. How to install a flashing on a metal roof.
This is not the correct way to install counterflashing because when the caulk fails water will simply run straight in behind the flashing and will leak. Following is the proceedure for installing the DSA flashing. Using a compass draw out the chimneys diameter.
A 7 14 grinder or saw is about the smallest dia machine that will work on stone if its very irregular. The evenly spaced ridges of the roofing profile present a real challenge. If due to the contour and design this is simply impossible use lots of underlayment sealed to the chimney work in a 1 x 6 collar around its base more underlayment around that flash up the wood collar returning to the chimney and using a compass to allow you to trace the exact chimney contour onto the flashing.
Make sure you leave a gap of two inches at the base for the water to drain. A Do-it-yourself Video detailing step by step how to flash a chimney with our Metal Roofing Chimney Kit. Now you need to install the step flashing.
Apply the plastic roofing cement to both sides of the chimney starting at the base.
List Pict How To Flash A Stone Chimney On A Metal Roof
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