Mendocino/Fort Bragg
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Modular Homes

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Here we have a typical modular home roof. I will be addressing 3 common problems found on many of these roofs. The first one is roof angle (or slope). Many of these homes have what's called a 1 1/2 to 2 1/2 roof pitch. What this means is that the angle is very low for composition roofing. A proper pitch for shingles begins at 4/12 (which is 4' of rise for 12' of length). Lots of these roofs are out there with no "apparent" problems, but when you look closely all kinds of things appear. The best way to re-roof these is to put on a product designed for low slopes. Easy enough except that low slope products aren't as visually appealing as shingles. Fortunately the low pitch isn't highly visible so often this isn't a major issue.

In this and most cases my first choice is a product called Dibiten. This time we went with black granulated Dibiten. You can see here the torching process which welds it to itself via the flame thrower. In other pictures to come in this section you will see more of this process.

Another problem to address is this very inexpensive and problematic type of skylight. We just cut and removed this one as one of the first steps in this re-roof.

The 2'x4' box you see here is called a curb. We will wrap it with the Dibiten to water proof it and then install a proper double dome skylight at the end of the job. This method elevates the skylight off the roof and allows water to flow around the curb as it should.

And here you have the finished skylight, done properly with a new double dome, curb mounted skylight. This skylight will not leak!

OK, here we go. The third problem with this roof is rafter area venting. Without getting too wordy at this point, let me just say that in most modular homes there needs to be a way for moisture vapor to leave the peak of the home. It may be a little hard to see but on this 7 year old home, most of the ridge already has moderate to severe rot occurring. The plywood and rafters were black and moldy and deterioration was well underway. The modular home industry is getting better in dealing with this but they have a lot farther to go. Keep in mind, again, this home is only 7 years old!

The next step is to cut the ridge line open 1 1/2" on both sides to let it breathe. We do this the entire length of the ridge.

Next we stop the new roof at the cut line and install a product called "Core-Vent". This is made just for this purpose and has proven to be a very reliable way of venting the ridge without leakage.

On this application we chose to finish it with shingle ridge trim. This procedure holds the Core-Vent tight to the roof and is very water tight.

Whew! A new roof system, new skylight system and ridge venting. This job had it all. But here you see the finished roof done properly. Now our homeowners can relax for 20 or more years (at least regarding the roof). I'm hoping in years to come the modular home industry will make these improvements to their initial construction thereby having it done right the first time.

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