Traditional Roofing Magazine, a division of Joseph Jenkins Inc.

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Traditional Roofing Magazine #8 -- Fall/ Winter 2010/2011

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How to Build a Snow Apron on a Slate Roof

Joseph Jenkins

Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

1. Above we see eaves on a 4:12 sloped slate roof that has suffered chronic leakage from ice damming. Although heat cable had been installed, it had been nailed through the slates with 16 penny nails, doing more harm than good.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

2. Pull off all the slates and expose the rotted mess that you’re sure to find underneath.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

3. Repair the rafters by scabbing new wood where needed.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

4. Install new roof decking material. This is 1 inch thick rough-sawn hemlock lumber, similar to the material used on the original roof.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

5. Install 30 pound felt over the repaired roof deck to weather it in.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

6. Install red rosin paper over the felt. This “slip sheet” is to allow the copper to expand and contract without sticking to the underlayment.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

7. Install a copper drip edge. This is 16 ounce copper.


16 OUNCE COPPER FLASHING ROLLS sold at the Slate Roof Warehouse


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

8. Prepare your copper flat-lock pans. These are 20 ounce half-hard copper pans made from 18 inch by 24 inch stock. Read more about flat-lock soldered copper. Ideally, the pans will be pre-tinned with something like a Wenesco Solder Trough.


Traditional Roofing Magazine Issue #8:How to Build a Snow Apron on a Slate Roof

9. Prepare 20 ounce copper cleats.

Traditional Roofing Magazine Issue #8:How to Build a Snow Apron on a Slate Roof

10. Cleat the pans to the roof.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

11. Hook the joints together, cleat the pans down, pound the seams flat with a dead-blow hammer, then solder the pans together. We’re using 50/50 tin/lead solder and an Express soldering iron here. We also use American Beauty electric soldering irons, Aero acetylene, and Sievert propane soldering irons for this work. All are available at SolderWarehouse.com.


SOLDER WAREHOUSE - Your source for bar and wire solder, soldering irons, flux, and other soldering supplies.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

12. Continue to install and solder the copper snow apron pans until all the pans are installed.


50:50 Tin Lead BAR AND WIRE SOLDER sold at the Solder Warehouse


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

13. Hang a 1/2 inch by 1 inch cant strip (cut from the same hemlock roof deck lumber) on copper or stainless steel wires so that the slates will overlap the copper approximately 6 inches and overlap the cant strip approximately 2 inches. Use chalk lines to keep things straight. If the ice dam reaches high enough up the roof that it covers the joint between the slates and the copper, the roof can leak, so make sure your snow apron extends high enough to avoid this problem.

Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

14. Install the starter course of slates, back side up.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

15. Install the field slates with nails and bibs or slate hooks.


Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof

16. You now have an eave assembly that is not just water-tight but also waterproof!


Finally, you can solder copper snow guards onto the copper pans if you need a snow retention system.

Traditional Roofing Magazine Issue #8: How to Build a Snow Apron on a Slate Roof


We have the largest selection of snow retention systems for roofs available on the internet at the Snow Guard Warehouse!


SolderWarehouse.com

 

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