Solar strut provides the foundation between the roof and solar array. It is important to first draw and chalk out the layout then proceed to rafters. Most homes are either built with a 16 ir 24 " distance between the two rafters. Most spacing is done by using every other rafter or a 32 to 48 inch span. This distance provides support for the array without comprimising and windload issues. Solar strut is expensive and should be used prudently. I learned this the hard way. I was overy concerned with the wind loads so I spaced the strut every 24 inches and it cost an extra 1000 dollars. I nearly lost my job, but rather took a pay cut.
In the end, solar strut provides a solid bond between the roof with the array, but can put a damper on costs.
Tuesday, June 15, 2010
Sunday, June 13, 2010
Hickam Airforce Base 147 kW Project
21st Century Technologies has begun a project on Hickam Airforce Base that is considered the largest armed forces installation in Hawaii. After getting all of the roof materials to the project, we started the layout for 120 Evergreen panels that will be mounted to cool ply. This new innovative roofing material has three mainfunctions.
1. Provides strong material for historical roofs
2. A cement called MBR is mixed attaches the cool ply to the roof.
3. Two comprails are attached to the top part of the cool ply.
The cool ply dimensions are 135.5 x 57.50 inches. The panels are slightly longer than the width of the cool ply. The layout must consider the difference between cool ply and panel. We were able to fit 140 cool ply on the roof.
1. Provides strong material for historical roofs
2. A cement called MBR is mixed attaches the cool ply to the roof.
3. Two comprails are attached to the top part of the cool ply.
The cool ply dimensions are 135.5 x 57.50 inches. The panels are slightly longer than the width of the cool ply. The layout must consider the difference between cool ply and panel. We were able to fit 140 cool ply on the roof.
Wednesday, June 2, 2010
Hidden Wires in Rafters, Beams, or Eaves!
There are times when an electrician will hide wires within the beams or rafters for a few reasons. An open beam home will not have the options of hidding wires in the attic space, and consequently hide them inside the beams or on the side. This can be a severe issue without the help of the homeowner, builder, or building plans. It is imperitive to locate the wires in the beam before any penetration.
A two man team with cellphones are crucial. One man will find the wires, measure them from the eave to the wire and relay. The roofer will mark the no zones on the roof and evaluate layout for pins. Most likely the layout will be slightly different, but will not hinder structural untegrity. A roof-bolt can not be more than four feet away.
A two man team with cellphones are crucial. One man will find the wires, measure them from the eave to the wire and relay. The roofer will mark the no zones on the roof and evaluate layout for pins. Most likely the layout will be slightly different, but will not hinder structural untegrity. A roof-bolt can not be more than four feet away.
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