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Dwight Hartman
30th April 2010, 14:22
I'm Dwight Hartman. My wife Colleen and I are building our 2nd house. This is on the Key Peninsula in Pierce County, Washington USA - to the west from Tacoma across the Narrows bridge. We previously built a house over the span of several years near Issaquah, Washington. That house can be viewed at treehousepoint.com and is owned by a couple that build very well constructed tree houses and use the house that we built as a bed & breakfast lodge and location for small conferences and weddings.

Our new house is constructed primarilly of Perform Wall, an ICF product similar to Rastra. This will be our retirement home as we are both in our 60's. The work done thus far on the house was performed by Green Bridge, Inc. and paid for from the proceeds of the sale of our first house. To continue with Doyle Lewellen, who owns Green Bridge, Inc doing all of the work, would require that we obtain a construction loan - no small feat in todays economy, and especially to build anything other than a standard recognizable stick frame house on a standard subdivision lot where it will look like every other house lined up for sale. Therefore we will continue the work ourselves with Doyle, who is an excellent contractor whom we highly recommend, serving as a consultant.

My entire working experience for 33 years was in municipal and county land use management. I was usually in a management position however I wrote many codes and ordinances and advised city and county councils and planning commissions, design review boards etc and worked with the public when they wanted to do something on their property. As a result, I know what is and what is not possible to get approved and can comfortably talk with the people (regularors and inspectors) that anyone who wants to do something on their property has to deal with.

Since we can't hire everything done now, we will be doing it all except those items such as septic system and fire sprinkler system instalations that must be done by a licensed contractor.

We are presently getting ready to put the exterior finish on the perform wall and install windows. I know that Perform Wall and Rastra structures have usually had a stucco finish applied on their exteriors. Because we want to do the exterior finish ourselves, we plan to use Hardi Plank siding with cedar trim on the perimeter of our vinyl windows. Thus far, I have not been able to find realy good information on how to do this.

I know that vertical strips of some wood type material has to be adhered to the perform wall/rastra walls to serve as nailing surfaces for the siding. I expect that should also be fastened to the surface around the perimeter of all windows and doors. I know there are special products that need to be used to seal all air and water gaps around the windows and doors. Should the walls be sealed with a spray on or roll on sealer, or should Tyvek be used on the walls over the nail on strips?

Any information that can be provided would be valuable. We are comfortable in stating that Perform Wall is an excellent product to work with. We have extensive digital photo records of our entire building process and would be happy to provide anyone who is interested with those photos.

thanks, Dwight

Rob Beckers
4th May 2010, 05:48
Hi Dwight,

Welcome to Green Power Talk, and congrats with the new house!

I'm not a contractor, so for what it's worth: My warehouse was built using SIPs (regular SIPs, not Perform Wall). The procedure there was to wrap the outside in Tyvek, starting at the bottom so it overlaps in a way that sheds water to the outside. Some 1-by strapping was then nailed to the Tyvek, to have an air space (for drying) and to have a nailing surface for the board-and-batten that went on the outside. You can see pictures of it in this thread (http://www.greenpowertalk.org/showthread.php?t=5334&highlight=warehouse).

For windows the standard is to put Blueskin on the rough opening's bottom, and 6" up the sides on either side. The window is then put in place, foamed in with low-expanding PU-foam, and depending on the how it was set in (and width of the jambs) you may need to make jamb-extensions from aluminum to bridge the gap to the outside. The underlying thought through it all is to shed water to the outside. So the Tyvek on the bottom needs to lap under the Blueskin, on top it laps over the outside of the window flange (if there is one). One of the magazines I read, Fine Homebuilding, has a number of articles that detail proper window installation. Looks like at least some of them are free to read for non-members, take a look at this link (http://www.finehomebuilding.com/how-to/install-replacement-windows-and-flashing-correctly.aspx?nterms=61648). Truth is that all the professional window installers that I've watched don't follow best practices (their focus seems to be on speed), and it is pretty easy to do a better job by yourselves.

When you have some time, post a few pictures of your construction ventures. It's easy (you can upload just about any size/resolution to the board, it'll take care of scaling it).

-RoB-