<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Thanks for the several responses to my query re the weight of dense pack cellulose and its potential for causing a bulge in the drywall.</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Strapping the ceiling is precisely what I would like to avoid if possible. ie This adds to the cost and complexity of the project.</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Re weight, the question is, will 3 concentrated pounds of cellulose cause a bulge in the ceiling drywall? (3.5 pounds/cu ft). The openings I'm talking about are less than a cubic foot in size.</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">I am assuming that is dry weight; wet would be heavier, n'est pas?</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Opinions?</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Thanks, Sacie</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 14, 2017 at 8:19 AM, Clarke Olsen <span dir="ltr"><<a href="mailto:colsen@fairpoint.net" target="_blank">colsen@fairpoint.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">You could strap he ceiling with 1x2, 12" oc. Side effect is flattening of the ceiling plane.<br><div>
<span class="m_-5497043933544630045Apple-style-span" style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span class="m_-5497043933544630045Apple-style-span" style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div style="word-wrap:break-word"><span class="m_-5497043933544630045Apple-style-span" style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div style="word-wrap:break-word"><span class="m_-5497043933544630045Apple-style-span" style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div style="word-wrap:break-word"><span class="m_-5497043933544630045Apple-style-span" style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div style="word-wrap:break-word"><span class="m_-5497043933544630045Apple-style-span" style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div style="word-wrap:break-word"><span class="m_-5497043933544630045Apple-style-span" style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div style="word-wrap:break-word"><span class="m_-5497043933544630045Apple-style-span" style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><div style="word-wrap:break-word">Clarke Olsen<br><a href="http://clarkeolsendesign.com" target="_blank">clarkeolsendesign.com</a><br>373 route 203<br>Spencertown, NY 12165 <br>USA<br><a href="tel:(518)%20392-4640" value="+15183924640" target="_blank">518-392-4640</a><br><a href="mailto:colsen@taconic.net" target="_blank">colsen@taconic.net</a><br><br><br><br></div></span></div></span></div></span></div></span></div></span></div></span></div></span></span>
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<br><div><div>On Feb 14, 2017, at 8:59 AM, Bill Chaleff via Greenbuilding <<a href="mailto:greenbuilding@lists.bioenergylists.org" target="_blank">greenbuilding@lists.<wbr>bioenergylists.org</a>> wrote:</div><br class="m_-5497043933544630045Apple-interchange-newline"><blockquote type="cite"><br><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><span style="font-family:'Helvetica';color:rgba(127,127,127,1.0)"><b>From: </b></span><span style="font-family:'Helvetica'">Bill Chaleff <<a href="mailto:billarchtx@aol.com" target="_blank">billarchtx@aol.com</a>><br></span></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><span style="font-family:'Helvetica';color:rgba(127,127,127,1.0)"><b>Subject: </b></span><span style="font-family:'Helvetica'"><b>Re: [Greenbuilding] Weight of spray cellulose</b><br></span></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><span style="font-family:'Helvetica';color:rgba(127,127,127,1.0)"><b>Date: </b></span><span style="font-family:'Helvetica'">February 14, 2017 at 8:59:30 AM EST<br></span></div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><span style="font-family:'Helvetica';color:rgba(127,127,127,1.0)"><b>To: </b></span><span style="font-family:'Helvetica'"><a href="mailto:greenbuilding@lists.bioenergylists.org" target="_blank">greenbuilding@lists.<wbr>bioenergylists.org</a><br></span></div><br><br><font size="2" face="arial">
<div>Dense -pack cellulose is installed at a minimum of 3.5 pounds per cubic foot. That's the industry standard minimum to be "dense-pack."</div>
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<div style="clear:both">Bill Chaleff A.I.A., Leed AP</div>
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<div style="font-family:arial,helvetica;font-size:10pt"><div><div class="h5">-----Original Message-----<br>
From: Sacie Lambertson <<a href="mailto:sacie.lambertson@gmail.com" target="_blank">sacie.lambertson@gmail.com</a>><br>
To: Greenbuilding <<a href="mailto:Greenbuilding@lists.bioenergylists.org" target="_blank">Greenbuilding@lists.<wbr>bioenergylists.org</a>><br>
Sent: Mon, Feb 13, 2017 9:36 pm<br>
Subject: [Greenbuilding] Weight of spray cellulose<br>
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<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">I have a situation where cellulose will be sprayed under an existing attic roof. Thanks to a suggestion on this forum we are making ply gussets to extend the existing roof rafter to allow for at a minimum of 11 " of dense pack cellulose to be blown through netting against the spray foamed under roof.</div>
<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br>
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<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">My question is how heavy is 11" of sprayed dense cellulose? At the perimeter of the space, where the extended rafters meet the floor joists over the rooms below, will the cellulose sag so much it will create a potential bulge problem on the drywall that will be covering the ceiling below?<br>
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<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br>
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<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">The floor joists of the attic are old full 2x4s 16" apart. Where the potential sag might occur therefore is a space that is about 14"x11". The suggestion has been to take attach thin 2" wide plywood across the space, thus bridging it so the dense pack cellulose won't weigh too heavily and protrude into the ceiling space below.</div>
<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br>
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<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">However if we do this, we will obviously have to cover the entire ceiling this way before we put up drywall.</div>
<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br>
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<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">(The unseen dilemmas of rebuilding a very old house)</div>
<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br>
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<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Thanks for all good opinions.</div>
<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br>
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<div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Sacie</div>
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