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Framology - Nog'less Sheathed Framing
Nog/Dwang free external wall framing, sheathed in RigidRAP-XT® improves thermal performance.
Nog'less Sheathed Framing
RigidRAP-XT + NZ Standards
Combining the use of RigidRAP-XT by IBS with NZS:3604:2011 clause 8.5.4
(a) Lateral support of studs.
Too often timber wall framing is specified and then constructed in such a way that actually negatively impacts the structure’s overall performance. Sometimes it is a case of ‘less is more’ particularly from a thermal performance perspective.
Nogs/Dwangs have their uses (particularly for some cladding types) but often when not needed for cladding purposes, they still get specified at spacings that contribute to higher construction costs, added weight and, most importantly, compromised insulation performance due to the thermal bridging from un- needed rows of nogs.
What does NZS:3604 say?
NZS:3604:2011, clause 8.5.4 Lateral support of studs
All studs shall be laterally supported by either:
a) Exterior wall cladding complying with E2/AS1 or interior linings complying with section 12. Such material shall be fixed to the studs by direct nailing of cladding or lining material, provided that building paper or similar material not exceeding 3mm thick may separate the lining or cladding material from the stud; or
b) Dwangs, wailings, or metal angle wailings in accordance with 8.8
Clause (a) in a nut shell: if the wall is lined then studs are restrained.
The BRANZ House Insulation Guide highlights the need to measure and potentially rationalise the percentage of timber in exterior wall framing in an effort to achieve the desired R2.0 construction value directed by H1/VM1 5th edition.
PlaceMakers Frame & Truss is first in market routinely supplying project specific data on the timber to wall area percentage for every build – Framology Timber Percentage Report.
Removing dwangs when not needed and combining the timber framing with an insulated rigid air barrier is one avenue for achieving a true R2.0 construction value in 90mm framing when you are accounting for the presence of all timber within the wall frame.
We are able to supply you with nog free exterior framing, sheathed in RigidRAP-XT® by our Frame & Truss plants in selected regions of NZ.
RigidRAP-XT for Walls
IBS RigidRAP®-XT is the only triple layer rigid air barrier system available in New Zealand with a thermal break laminated on the back of each board.
IBS RigidRAP®-XT is an 8mm Oriented Strand Board (OSB3) product that has been laminated with an approved building paper to give your house dual protection from the weather during your building process as well as a thermal break 10mm graphite polystyrene board on the inside making it ideal for timber frame buildings. IBS RigidRAP®-XT is not only a temporary weather cladding, but it also provides bracing. The product is lightweight and easy to cut, nail or screw, it can also be exposed to the weather for up to 90 days. Total board thickness is 18mm.
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The Framology System
1. Framology Timber Percentage Report
Our Framology Timber Percentage Report; giving you clear, accurate data for calculating H1 compliance
Alignment with the BRANZ House Insulation Guide Tool
2. Framology Nog’less, Sheathed Wall Framing
- Can be utilised as a bracing element when architects use IBS RigidRAP-XT® literature.
- Recommended to be combined with MiTek StudLOK® screws for top plate & lintel fixings, saving you time onsite.
- Can be combined with MiTek Stud Savers, removing junction studs which further increases thermal bridging and makes it easier to run insulation behind wall junctions.
There is a diverse range of cladding products available in the New Zealand market; some rely on the presence of nogs/dwangs for support, others do not. Discuss the compatibility of a nog’less wall system to your project with your lead designer.
TIMBER PERCENTAGE REPORT
Smart thinking, Manufactured.
Discover our Framology Timber Percent Report; giving you clear and accurate data for calculating H1 compliance.
Sustainability
As the industry moves to building homes with improved thermal performance, it is more important for designers and builders to understand what thermal bridges are and how their impact on the build can be reduced.
PlaceMakers Frame & Truss is leading the industry by:
- Providing clear, accurate, project specific data on the timber to wall area percentage (thermal bridging) via our Framology Timber Percentage Report.
- Providing a smart new solution which removes nogs/dwangs, reducing thermal bridging and combining it with an insulated rigid air barrier (fixed in factory), further boosting R-Value.
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Building waste is a problem in NZ; we look to partner with recycling companies to ensure that our offcuts don’t all end up in landfill. |