Let’s Talk About Vinyl Siding, Part 2

In our previous post we looked at some of the common requirements regarding vinyl siding installation. Today we’ll talk about a few of the more obscure details that we need to understand to assure the vinyl siding will perform properly.

Generally, manufactured homes do not have a house wrap or weather barrier (such as Tyvek®) installed under the vinyl siding. This “house wrap” helps prevent water and air infiltration and is required in most other types of residential construction. However, it is not required by the Manufactured Home Construction & Safety Standards. A few manufacturers may offer “house wrap” as an option.

All manufacturers should be providing flashing at the corners of windows and doors to prevent any water that penetrated the siding along the frame of the window from seeping into the walls.

Window flashing intended to channel water away from the wall.

 

Most of the flashings I have seen is felt paper installed at each corner of the windows/doors that runs to the bottom of the floor. Installers should be paying attention to ensure that the flashing on the end walls is in place and intact. If the flashing does not extend to the bottom of the floor, it may be designed to channel water into the weep holes of the siding just below the window. You will have to place the flashing to overlap the nail flange to direct any water away from the wall.

Fit J channel at corners to prevent water infiltration.

Speaking of water infiltration, be sure when installing “J Channel” around windows or doors to avoid “butt joints”. “J Channel” should be trimmed, fitted and over-lapped at joints and corners (see above illustrations) to keep water away from the wall.

As we have discussed in previous posts, make certain that the installation of the skirting material does not damage the vinyl siding or restrict the ability of the siding to expand and contract with changing temperatures. In my opinion, under no circumstances should the bottom course of siding be cut off for skirting installation. Keep in mind, the home must remain transportable and if the siding is no longer attached to the starter strip, it will blow off in transit.

Do NOT cut the bottom course of siding for skirting installation.

Should you come across any damaged vinyl siding, it must be replaced. There are no repair methods to fix broken vinyl. This would also include any siding with a broken nailing flange. If the siding cannot be secured as required, it must be replaced.

Broken nailing flange, siding should be replaced.

 

As you know, vinyl siding is combustible. So, when installing exterior light fixtures on vinyl siding (or a vinyl mounting block), there should be no vinyl exposed inside the fixture that could offer fuel to any electrical fire. Unless the fixture canopy is the same size and shape as the junction box, you will need to install a non-combustible “flash ring” to isolate the vinyl from the wiring. For new homes, that manufacturer should have provided any needed flash rings.

Typical Flash Ring for a carriage light.

For more information on vinyl siding installation, check out the instructions that are provided from the manufacturer, or if not available, visit the website from the Vinyl Siding Institute at: https://www.vinylsiding.org/installation/installation-manual/

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