FHB Logo Facebook LinkedIn Email Pinterest Twitter X Instagram Tiktok YouTube Plus Icon Close Icon Navigation Search Icon Navigation Search Icon Arrow Down Icon Video Guide Icon Article Guide Icon Modal Close Icon Guide Search Icon Skip to content
Subscribe
Log In
  • How-To
  • Design
  • Tools & Materials
  • Restoration
  • Videos
  • Blogs
  • Forum
  • Magazine
  • Members
  • FHB House
  • Podcast
Log In

Discussion Forum

Discussion Forum

How should I insulate Giant scissor t…

| Posted in General Discussion on November 8, 1999 06:53am

*
One of my latest ventures is a 2400 SF single story ICF wall house. The walls are 8′ tall on the sides, and angle up to 16’high at the center of the house, all of the ceilings inside are vaulted up to the center point of the house. The trusses are steel. The exterior (roof) pitch is a 6/12, the interior is a 3/12, so there is about 6 or 7 feet of height in the attic at the ridge. We are about to hang drywall, and at the advice of an insulation contractor, we are planning to blow in cellulose on top of the drywall and bottom chord of the steel truss to an R-30. I was talking to another builder, and he said I would have trouble with the cellulose sliding down the sheetrock over time, and that some netting needed to be employed first. The house is 60′ wide, so each side of the vault is about 35′, I asked the insulation contractor about it, and he laughed…..am I being taken on a ride down a cellulose slide? appreciate it in advance, and by the way, the house is sold, so I want it done right, no chance for call backs.

Reply
  • X
  • facebook
  • linkedin
  • pinterest
  • email
  • add to favorites Log in or Sign up to save your favorite articles

Replies

  1. Ron_Schroeder | Nov 03, 1999 07:22pm | #1

    *
    I would put sheet foam between the steel truss and the drywall for a thermal break and wet spray the cellulose. At 3/12 pitch you may not have a problem even with dry spray, ask several cellulose contractors.

    1. Sue_V. | Nov 05, 1999 04:29am | #2

      *Is there an Icynene contractor in your area? I would have Icynene sprayed on the underside of the roof. It would not need to be held in place, and it certainly wouldn't slide. It is ideal for steel, and you would not need to ventilate the roof. Good Luck - do your homework.Sue

      1. Ian_ICF_Builders | Nov 05, 1999 06:58am | #3

        *Thanks guys...& gal.I checked into a couple jobs the insulation contractor has done, and they are performing well. He is going to spray wet cellulose in after drywall. I checked into Icynene, but it was spendy. There is a urethane foam guy in the area, he offered a system that was walkable, even between the trusses, directly over the drywall, he was less than the Icynene, and I thought the fact that it was walkable would be beneficial since I know someone, if they have to go up there will slip off the steel and probably poke a hole in the ceiling...the day before closing or some convenient time. Thanks again Ian

        1. andrew_d | Nov 08, 1999 06:50am | #4

          *Wet cellulose after drywall? My impression was that wet cellulose was for when you didn't have barriers in place to contain it. Can't you just use plain vanilla dry cellulose and possibly get better void-avoidance? :) Ram in it there like heck -- not fluffy at all, the more the better -- and it will not move anywhere. I've experimented with driving cellulose into wall stud cavities with a temporary form, and the cellulose stayed in the cavity uncovered for weeks afterward.

  2. IanICF_Builders | Nov 08, 1999 06:53am | #5

    *
    One of my latest ventures is a 2400 SF single story ICF wall house. The walls are 8' tall on the sides, and angle up to 16'high at the center of the house, all of the ceilings inside are vaulted up to the center point of the house. The trusses are steel. The exterior (roof) pitch is a 6/12, the interior is a 3/12, so there is about 6 or 7 feet of height in the attic at the ridge. We are about to hang drywall, and at the advice of an insulation contractor, we are planning to blow in cellulose on top of the drywall and bottom chord of the steel truss to an R-30. I was talking to another builder, and he said I would have trouble with the cellulose sliding down the sheetrock over time, and that some netting needed to be employed first. The house is 60' wide, so each side of the vault is about 35', I asked the insulation contractor about it, and he laughed.....am I being taken on a ride down a cellulose slide? appreciate it in advance, and by the way, the house is sold, so I want it done right, no chance for call backs.

Log in or create an account to post a comment.

Sign up Log in

Become a member and get full access to FineHomebuilding.com

Video Shorts

Categories

  • Business
  • Code Questions
  • Construction Techniques
  • Energy, Heating & Insulation
  • General Discussion
  • Help/Work Wanted
  • Photo Gallery
  • Reader Classified
  • Tools for Home Building

Discussion Forum

Recent Posts and Replies

  • |
  • |
  • |
  • |
  • |
  • |
View More Create Post

Up Next

Video Shorts

Featured Story

Fire-Resistant Landscaping and Home Design Details

These defensive details give homes a better chances of surviving wildfires.

Featured Video

How to Install Cable Rail Around Wood-Post Corners

Use these tips to keep cables tight and straight for a professional-looking deck-railing job.

Related Stories

  • From Victorian to Mid-Century Modern: How Unico Fits Any Older Home
  • Designing the Perfect Garden Gate
  • Vintage Sash Windows Get an Energy-Efficient Upgrade
  • Design and Build a Pergola

Highlights

Fine Homebuilding All Access
Fine Homebuilding Podcast
Tool Tech
Plus, get an extra 20% off with code GIFT20

"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Fine Homebuilding Magazine

  • Issue 332 - July 2025
    • Custom Built-ins With Job-Site Tools
    • Fight House Fires Through Design
    • Making the Move to Multifamily
  • Issue 331 - June 2025
    • A More Resilient Roof
    • Tool Test: You Need a Drywall Sander
    • Ducted vs. Ductless Heat Pumps
  • Issue 330 - April/May 2025
    • Deck Details for Durability
    • FAQs on HPWHs
    • 10 Tips for a Long-Lasting Paint Job
  • Issue 329 - Feb/Mar 2025
    • Smart Foundation for a Small Addition
    • A Kominka Comes West
    • Making Small Kitchens Work
  • Issue 328 - Dec/Jan 2024
    • How a Pro Replaces Columns
    • Passive House 3.0
    • Tool Test: Compact Line Lasers

Fine Home Building

Newsletter Sign-up

  • Fine Homebuilding

    Home building tips, offers, and expert advice in your inbox.

  • Green Building Advisor

    Building science and energy efficiency advice, plus special offers, in your inbox.

  • Old House Journal

    Repair, renovation, and restoration tips, plus special offers, in your inbox.

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters

Follow

  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X
  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X

Membership & Magazine

  • Online Archive
  • Start Free Trial
  • Magazine Subscription
  • Magazine Renewal
  • Gift a Subscription
  • Customer Support
  • Privacy Preferences
  • About
  • Contact
  • Advertise
  • Careers
  • Terms of Use
  • Site Map
  • Do not sell or share my information
  • Privacy Policy
  • Accessibility
  • California Privacy Rights

© 2025 Active Interest Media. All rights reserved.

Fine Homebuilding receives a commission for items purchased through links on this site, including Amazon Associates and other affiliate advertising programs.

  • Home Group
  • Antique Trader
  • Arts & Crafts Homes
  • Bank Note Reporter
  • Cabin Life
  • Cuisine at Home
  • Fine Gardening
  • Fine Woodworking
  • Green Building Advisor
  • Garden Gate
  • Horticulture
  • Keep Craft Alive
  • Log Home Living
  • Military Trader/Vehicles
  • Numismatic News
  • Numismaster
  • Old Cars Weekly
  • Old House Journal
  • Period Homes
  • Popular Woodworking
  • Script
  • ShopNotes
  • Sports Collectors Digest
  • Threads
  • Timber Home Living
  • Traditional Building
  • Woodsmith
  • World Coin News
  • Writer's Digest
Active Interest Media logo
X
X
This is a dialog window which overlays the main content of the page. The modal window is a 'site map' of the most critical areas of the site. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page.

Main Menu

  • How-To
  • Design
  • Tools & Materials
  • Video
  • Blogs
  • Forum
  • Project Guides
  • Reader Projects
  • Magazine
  • Members
  • FHB House

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Popular Topics

  • Kitchens
  • Business
  • Bedrooms
  • Roofs
  • Architecture and Design
  • Green Building
  • Decks
  • Framing
  • Safety
  • Remodeling
  • Bathrooms
  • Windows
  • Tilework
  • Ceilings
  • HVAC

Magazine

  • Current Issue
  • Past Issues
  • Magazine Index
  • Subscribe
  • Online Archive
  • Author Guidelines

All Access

  • Member Home
  • Start Free Trial
  • Gift Membership

Online Learning

  • Courses
  • Project Guides
  • Reader Projects
  • Podcast

More

  • FHB Ambassadors
  • FHB House
  • Customer Support

Account

  • Log In
  • Join

Newsletter

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Follow

  • X
  • YouTube
  • instagram
  • facebook
  • pinterest
  • Tiktok

Join All Access

Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features.

Start Your Free Trial

Subscribe

FHB Magazine

Start your subscription today and save up to 70%

Subscribe

Enjoy unlimited access to Fine Homebuilding. Join Now

Already a member? Log in

We hope you’ve enjoyed your free articles. To keep reading, become a member today.

Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine.

Start your FREE trial

Already a member? Log in

Privacy Policy Update

We use cookies, pixels, script and other tracking technologies to analyze and improve our service, to improve and personalize content, and for advertising to you. We also share information about your use of our site with third-party social media, advertising and analytics partners. You can view our Privacy Policy here and our Terms of Use here.

Cookies

Analytics

These cookies help us track site metrics to improve our sites and provide a better user experience.

Advertising/Social Media

These cookies are used to serve advertisements aligned with your interests.

Essential

These cookies are required to provide basic functions like page navigation and access to secure areas of the website.

Delete My Data

Delete all cookies and associated data