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Cutting Aluminum Soffit And Fascia
aluminum blade for soffit and fascia
Aluminum-cutting blade in a chopsaw. Lubing the blade with WD-40 improves cutting results.

Working with aluminum soffit and fascia involves cutting operations that use a combination of hand and power tools. Besides a good pair of aviation snips for medium-sized cuts, I use a pair of small, first-aid scissors for completing tiny cuts accurately. And you can’t beat a sliding compound mitre saw for large, repetitive cuts. The blade I prefer is made especially for soffit and fascia work, and slices more cleanly and quietly than a regular crosscut blade. For best results, also give a quick shot of WD-40 to the teeth after every few cuts, to extend blade life.

soffit fascia j-channel
J-channel holds the back edge of aluminum soffit in place. Here it is installed under the eaves of a SIPs panel roof.

The factory-applied finish on the aluminum you’re working with will last for decades outdoors, but it’s surprisingly easy to scratch while it’s going up. And with all the metal filings that build up around the saw after just a few cuts, it’s a dangerous place, especially when you’re working with dark brown aluminum that shows scratches so clearly. You can greatly reduce the scratch hazard by installing self-sticking felt pads onto the support arms of your saw. This protects the painted finish on those occasions when soffit and fascia needs to be cut with the finish facing down. I use the kind of felt sold to protect wood floors from furniture feet.

J-Channel And Soffit
Aluminum soffit upside down and in place on the outfeed table of a chopsaw. Note the felt on the table protecting the painted surface.

This phase of the work is simple, but if brick or stone veneer will be going up later, J-channel gets a little trickier. You’ll need to determine the amount of space the veneer requires, then locate the J-channel that same distance from the wall. Snap a chalk line to act as a guide, then fasten the J-channel with screws along the mark.

Soffit comes next, but watch out. Don’t assume that the lengths of each piece of soffit are the same for the entire building. Variations in eaves width are possible, so measure the area where you’re working to make sure that one size really does fit all. If not, you’ll need to custom-cut soffit pieces to suit. Aim for a soffit length that places the outside edge of the aluminum about 1/4-inch back from the outer face of the wooden eaves framing.

Aluminum nails sold for soffit and fascia work are soft and short, so it can be frustrating to drive them. I use a framing nail as a centre punch for getting nail holes started in pieces of soffit.

Getting Fascia Right
Next time you have a chance, measure a length of brown aluminum fascia that’s been sitting in the shade, then move it into the hot sun and measure again in fifteen minutes. A standard 12-foot piece expands by a whopping 1/4-inch as it heats up, and this fact affects the most visible parts of installing aluminum properly. When expansion and contraction issues are ignored, wavy, buckled fascia is a constant eyesore. It ripples when the sun shines, and smoothens out on cloudy days. You can certainly turn the odds in your favour by installing fascia during hot weather, but there’s a more important trick than that, and it’s not immediately obvious.

Rule #1 for attractive fascia installation: Nail as little as possible and never in the front face of the metal. Ignore this detail, and aluminum’s nasty habit of getting bigger on hot days will cause unsightly buckling and waviness. This is especially important where steep roofs with prominent gable ends remain exposed to view, unhidden by face-mounted eavestrough.
ring shark nail soffit
Stainless steel nail partially driven into over-sized hole in edge of fascia. The over-sized hole allows for expansion and contraction of aluminum.

Instead of face nailing fascia at the top, tuck it up underneath aluminum drip edge installed around the perimeter of the roof. This offers plenty of holding power along the top edge, but only when the approach is coupled with nails driven into oversized holes along the bottom edge of the L-shaped fascia profile. The trick here is using corrosion-proof nails that are long enough to extend securely into the solid wood of the roof frame. Standard aluminum nails are rarely available in the minimum 1 3/4” length required for this approach, and regular galvanized and electroplated nails will react badly with the aluminum in time. That’s why 2-inch long stainless steel nails are the way to go for securing the bottom edge of fascia. Predrill slightly oversized holes aligned with every third groove in the soffit, then hammer the nails home just tightly enough to take up all the slack.

fascia nail roofing
Soffit and fascia installed and ready to last a long time. Stainless steel nails hold much better than the traditional aluminum nails used for this application.

In the interests of good looks and weatherproofing, I never face-nail fascia. I always use polyurethane caulking as a glue instead. It comes in colours that match factory finished aluminum, and the long-term holding power of polyurethane is at least as good as nails. Lay down a small bead underneath a joint wherever you’d be tempted to face-nail two pieces of fascia, then temporarily hold the joint together with tape until the caulking cures. I’ve used masking tape and duct tape for this job, but the very best product is the high-strength double-sided No More Nails mounting tape made by LePage. It’s firm, very sticky and doesn’t leave adhesive residue behind when you peel it off in a day or two. Use the glue and tape approach where lengths of fascia meet on long runs, and where fascia ends at the bottom edge of a roof. Besides a cleaner appearance, glued fascia isn’t fastened to the underlying wood, so it’s free to move with temperature changes. The main thing to understand as that the fascia isn’t glued to the underlying wood, just glued to neighbouring pieces of fascia.