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  • How to Install a Ridge Cap

  • How to Install Ridge Cap


    Now that we've installed panel on both sides of the valley, we have to close off the ridge lines. On the right-hand side, we have an open ridge, so we'll be installing a ventilated ridge. And on the other side, the ridge is closed. The installation of the ridge cap is the same as the hip cap. We use a Z-trim and make sure to have tape seal underneath the Z-trim and between the ridge cap and the top of the Z. You cut Z-trims for the top of your panels. You use your ridge cap to mark the ribs so that you know where to place the Z-trims. Once the Z-trim has been fastened to the roof panel, you position your ridge cap and fasten it to the Z-trim using POP rivets. If you want to finish the ridge cap at the gable, let it over hang by about an inch, make your marks, and bend it down. The result is a nice clean look, and it will ensure that water doesn't get in between the top of the gable trim and the underside of the ridge cap.

    Next, we're going to start working on the vented ridge in this application for SL-16. Venting a ridge is very important for any kind of roof and there are a lot of things we must consider.

    Soffit Venting vs Gable Venting

    Every building is different, and every house, every building has to be evaluated based on the construction and what's taking place inside the roof cavity, what kind of insulation there is. Generally, there's a lot of confusion about venting soffit and ridge versus gable venting. So one important note is to make sure that you're using either a ridge vent in combination with open soffits or you're using gable venting, but that you're not combining the two. If you combine the two, cross airflow cancels each other out and you end up with a much less effective venting of your roof cavity. In this particular installation, we have open soffits, so we're going open the ridge line so that we can install our panel and the profile vent material.

    Venting a Soffit

    We're going to start by making an opening 2” on either side of the ridge. I've made a pencil mark 2” here and here. I'm going to snap a chalk line and that's going to serve as my cut. Now we have a chalk line 2 inches from the center of the ridge and I'm going to cut this using a circular saw to make sure that the ridge is vented in combination with the soffit vents. A quick tip before we start cutting: set the depth of your blade so that you're really only cutting through the decking of the wood. In this case, we have ¾” plywood, so I'm going to set the depth of the blade to give or take an inch or 3/4 of an inch. This ensures that I don't cut through trusses.

    As you get to a gable or in this case, a sidewalk, you want to stop 1 or 2 feet short with your cuts. In this case, I'm going to stop just about here with my cuts.

    Installing a Vented Ridge Cap

    Now we're ready to deal with a vented ridge cap. As you can see, we've made a cut 2 inches on either side of the center line of the ridge. We now have to install a ridge cap with the vented ridge material. I’m going to use an ABC vented ridge material that’s been die cut to fit the SL-16 panel. We're going to install it using the clip system and tape seal on the underside. The first thing that we want to do is make our mark so that we know where to position the profile vent. Then, I’ll put the ridge cap in place, mark the tops of the ribs and line it up with the ridge line. I’m going to take my pencil and make a mark on my ribs. Once I remove the cap, I know that I need to line up the profile vent with the marks that I have just made.

    Installing the Clips

    The profile vent system consists of the vented material and the clips. The first thing that we have to do is install two clips per SL-16 panel and then thread the profile vent through the clips. The way that the clips are installed is, we have our mark here on the rib, so we know where the ridge cap ends and we want to make sure that the profile vent is a good 1 inch behind that line. So I'm going to position my clip right about there and I'm going to screw in through the pilot hole at the top of the clip. Once the clip is in place, I'm going to put the first screw through.

    Now we have an installed clip. The way it's designed is you just lift the clip up so that we can put the profile vent in. I'm going to install the second clip so that we can thread the profile vent material through it and fasten it to the roof deck.

    Now that I've had the two clips installed, I've bent them both up so I can thread the material through. We are going to go ahead and install it, bring the two clips down. And all that's left to do is put a screw through the back of each one to hold it down. That's one, and now I'm going to install the fastener at the back of the clip, and you can see that there is a pre-drilled hole to make life a lot easier. Once that’ done, we have the installation of two clips with a profile vent held securely in place.

    Fastening the Ridge Cap to the Clips

    So now that we have the profile vent installed, we've used two clips per SL-16 panel. The next thing to do is put the ridge cap in place and fasten it to each of these clips. So that's what we're going to do now. So I'm going to position the ridge cap, making sure that it's aligned with the center of the ridge. And the profile vent, we've kept it back from the line, because we don't want it visible to the naked eye when people are looking up at the ridge line. So make sure that it's back at least an inch, and you can then go back an inch and a half to two inches. Now that the ridge cap is in place, I'm going to go ahead and fasten it to the clips using stitch screws. So I've secured the ridge cap to the clip using a stitch screw, and I'm going to do that the whole length of the ridge, and then the ridge cap will be securely fastened to the roof.

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