[Greenbuilding] Decking a Boathouse Roof

[Michael O'Brien]

Hi, Lynelle—

We had a local roofing company cut a sheet of EPDM to fit as a single continuous membrane. No leaks in 8 years.

A cedar deck sits on the membrane, no penetrations.

Your guy may have suggested polystyrene to prevent condensation on the interior ceiling of the boat house?

Best wishes,

Mike O'Brien


On Aug 25, 2016, at 5:24 AM, Lynelle Hamilton <lynelle at lahamilton.com> wrote:

Thanks, John.

I appreciate your perspective.  I had a rooftop deck at my last house and used it a lot, so am pretty certain that this one will get used. I too, hate the thought of vinyl, but it seems that it's the simplest (and probably the least resource intensive) response and will address the pressing issue...the leaking roof. Just wish there was an alternative to vinyl for the decking that would be as waterproof and durable.

Lynelle


On 2016-08-25 12:58 AM, John Salmen wrote:
> The simplest roof assembly is structure (roof joists/sheathing of some sort), insulation (type 1 eps) roof board (typically fiberglass/ashphalt ½” thing – mechanically fastened), two part roof system on top of that (screw fastened base sheet/ adhered top sheet). Every roof supply company has the same basic system – can look at soprema. Will run about 5 to 8 can per square foot in cost depending on local contractors and size of roof/ details etc. That is a current flat roof – not a vinyl deck – vinyl deck will be comparable and probably simpler.
>  
> The roofing weight is minimal in itself as most roofs would carry at least 10llbs per foot for dead load (sheathing, ceiling drywall, roofing) – a wood deck added on top would add about 15lbs per sq. ft. dead load extra so you would need to look at the framing and see if it meets current environmental load requirements (things have changed) and if that could be added. Carpenters love to make decks as they get to rebuild them 10 years later
>  
> Sheathing the deck in plywood and then putting a vinyl deck surface is crappy but would keep the weight load down and use less materials so environmentally is probably a better solution – fewer trees used. They tend not to leak except at odd upright seams and will outlast wood finishes and replacement is better than replacing a wood deck.
>  
> I hate giving this type of advice as I know environmentally the vinyl deck solution is actually less destructive but is a horrible solution. As a designer I would ask if anyone would ever use the deck.
>  
>  
> From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org <mailto:greenbuilding-bounces at lists.bioenergylists.org>] On Behalf Of Lynelle Hamilton
> Sent: August-24-16 9:28 PM
> To: Green Building
> Subject: [Greenbuilding] Decking a Boathouse Roof
>  
> I have a boathouse on my property with a flat roof that, surprisingly. leaks.  I would like to put a deck on the roof, as the structure is strong enough to support it. However, I am stumped as to the best material to use to get a durable and waterproof surface that is walkable. My carpenter suggests rubber membrane, the styrofoam, then a wood deck, but I have concerns about the weight, plus the weight of folks on it. As well, maintenance might be an issue. Duradeck, etc are seem hardly to be green alternatives. Any ideas, folks?
> 
> Many thanks in advance.
> 
> Lynelle
> 
>  
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