Houseboat Top Fabric Options

“What fabric do you use?”

That’s a question we often hear, but the answer isn’t always the same. There are a few different options that we like to use. But it comes down to how you answer this question: “What do I want my cover to do?”

We will mainly talk about houseboat choices, whether you have a Big or Party top. We favor several options, but the decision is based on what appeals to you most.

Are you looking to stay cool in the shade? How about being safe from the rain? Do you remove the top during the offseason? How about a White top? We’ve been working in Lake Powell over the past seven seasons. All of these things get talked about while we’re down there. Let’s dive in.

Sunbrella

• Manufacturer: Glen Raven
• Material Type: Solution Dyed Acrylic
• Warranty: 10 Years (8 Years + 2 Years pro-rated)
• Life Expectancy: 5 – 12 years-depending on color and exposure

By a long shot, Sunbrella is the most commonly used fabric for big houseboat tops. The main reason is that the color has remained the same over a long period – sometimes up to 10 years. That’s an excellent run for a boat that’s always out in the sun. Sunbrella brings one of the most extended manufacturer warranties and an extensive color palette. It’s also woven, so it’s much more forgiving during installation. This is a real bonus if you take your old cover to a shop and ask them to copy it.

Sunbrella’s main downside? It’s only water-repellant; it’s not waterproof. If it’s not retreated with 303 Fabric Guard each year, it’s likely to leak. And we’re talking a lot, not a little. It’s also not very dimensionally stable. That can cause it to stretch out or shrink up. While the color lasts quite a long time, remember that the dark colors last much longer than the lighter ones.

Stam 6002

• Manufacturer: Serge Ferrari
• Material Type: Polyester 500/100dtex PES HT yarn with a PVDF Matte Varnish Warranty: 5 Years
• Life Expectancy: 10 – 20 years (These numbers are our best guess as we have only been using this product for one year, but we like it and have very high expectations)

This is the newest material we’ve been using recently, and here’s why. Stam 6002 is a weldable product, meaning we can bond two pieces together to make one solid membrane. Why do that? Because now it’s waterproof, provided new sewing is done. The PVDF coating helps to keep the product clean. That means you can choose a white fabric without fear that it’ll soon turn red from the Lake Powell sand.

The main downside is that it’s 18.5 oz/yard, which, depending on installation, can make it very difficult to remove and store during the winter. It also won’t be very forgiving if you want to take an old cover out to be copied. If Velcro flaps are used, sewing them in place will cause small holes from the needle and leak a bit. It also costs twice as much as Sunbrella usually does.

SeaMark

• Manufacturer: Glen Raven and Haartz
• Material Type: Sunbrella with Haartz PVC Coating
• Warranty: 5 Years
• Life Expectancy: 5 – 12 years (depending on color and exposure)

Glen Raven sends a regular Sunbrella to Haartz, where they apply a PVC coating to one side. This is an excellent choice if you’re looking for all the qualities in a Sunbrella but want waterproof and not just water resistant.

This product has been known to shrink after a while, so be careful when removing it for long periods. It can be tricky to get back on. We’ve also noticed that the Sunbrella will sometimes outlast the PVC coating on the underside. Stability-wise, it will have similar qualities as a coated product. This makes it a bad choice if you want to have a local shop try to replicate an old top.

Hardtop Conversion

At Sewlong, we do not offer Hardtop conversions, but we have gained some knowledge over the years. We are not, by any means, the be-all and the end-all information source, but we do know a thing or two, and we’re happy to share what we know if you’re considering this option.

Throughout most of our research, we found that the product used was extended PVC. There are two types of extended PVC: KomaTex and KomaCel. Make sure to ask which one is being used on your top. KomaCel is the one that your installer should be using. That’s because KomaTex does not survive sun or rain. KomaCel does not absorb water, keeping the top safe from rot and water degradation.

As for UV strength, you can expect three to four years in direct sunlight before degradation begins. To extend its life, an additional UV clear coat can also be added. If you’re going this route, we’d recommend getting a cover slip or some covered storage so you do not have to replace the whole thing every few years. KomaCel is about 40% more expensive than KomaTex. Most likely, that’s the reason why KomaTex is being used. We think it’s worth spending the extra money to keep your hardtop looking the way it should.

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