Comments on: Multi-Lat™ Design Assumptions http://structuralist.wordpress.com/2008/01/23/multi-lat%e2%84%a2-design-assumptions/ Just another WordPress.com weblog Thu, 19 Jun 2008 04:55:55 +0000 http://wordpress.com/ hourly 1 By: structuralist http://structuralist.wordpress.com/2008/01/23/multi-lat%e2%84%a2-design-assumptions/#comment-7 structuralist Thu, 19 Jun 2008 04:55:55 +0000 http://structuralist.wordpress.com/2008/01/23/multi-lat%e2%84%a2-design-assumptions/#comment-7 You can change this manually in the dead load input, but I also provided you with a material dead load worksheet that you can modify. You can change the description of the Batt insulation for example, and then change the material weight (in psf) to the right. I did this because I wanted to have the users tweak this out based on what you mentioned in your comment. I considered adding a multiplier for the roofing materials in case you wanted to add multiple layers. But as I recall, the typical material dead loads for applied roof (composition for example) generally takes into consideration a maximum of two 1/4" thick layers for residential or 2-roofs applied if asphalt shingle. If the dead load does not appear accurate, please let me know and I will make the changes you have made on your alpha version permanent on the material's worksheet. This is the kind of feedback I need - thank you Dennis You can change this manually in the dead load input, but I also provided you with a material dead load worksheet that you can modify. You can change the description of the Batt insulation for example, and then change the material weight (in psf) to the right. I did this because I wanted to have the users tweak this out based on what you mentioned in your comment.

I considered adding a multiplier for the roofing materials in case you wanted to add multiple layers. But as I recall, the typical material dead loads for applied roof (composition for example) generally takes into consideration a maximum of two 1/4″ thick layers for residential or 2-roofs applied if asphalt shingle. If the dead load does not appear accurate, please let me know and I will make the changes you have made on your alpha version permanent on the material’s worksheet.

This is the kind of feedback I need – thank you
Dennis

]]> By: lwainright http://structuralist.wordpress.com/2008/01/23/multi-lat%e2%84%a2-design-assumptions/#comment-6 lwainright Wed, 18 Jun 2008 15:42:25 +0000 http://structuralist.wordpress.com/2008/01/23/multi-lat%e2%84%a2-design-assumptions/#comment-6 Just a couple of observations on the design assuptions page. Due to the changes in the upcoming energy codes, add R-49 insulation to the dead loads calculator. Also, since most building codes allow for two layers of asphalt shingles (re-roof situations), this should be noted either in a footnote or as an option in the dead loads list. "Asphalt shingles (2 layers)" Basically, some way of noting that 2 layers should be accounted for. Just a couple of observations on the design assuptions page. Due to the changes in the upcoming energy codes, add R-49 insulation to the dead loads calculator. Also, since most building codes allow for two layers of asphalt shingles (re-roof situations), this should be noted either in a footnote or as an option in the dead loads list. “Asphalt shingles (2 layers)” Basically, some way of noting that 2 layers should be accounted for.

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