CONTINUOUS INSULATION PRIMER. PART 1 – Continuous Insulation Definition (ASHRAE 90.1)ASHRAE 90.1 Applications: Roof, Wall, and Foundations.

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Presentation transcript:

CONTINUOUS INSULATION PRIMER

PART 1 – Continuous Insulation Definition (ASHRAE 90.1)ASHRAE 90.1 Applications: Roof, Wall, and Foundations

Kinds of Continuous Insulation Foam Plastic Insulating Sheathing – EPS, XPS, Polyiso EPSXPSPolyiso Spray Polyurethane Foam – SPF (closed cell polyurethane) SPF Others – Rock wool – Fiberglass boards – Fiberboard

CI History & Experience In early 1900’s, solid wood board sheathing was considered as a form of continuous wall insulation (HEW, 1931) (~1.2 R/in) Cellulosic Fiber Insulating Board (‘Fiberboard’) is a form of continuous insulation in use since the early 1900’s (~2.5 R/in)

CI History & Experience Continuous insulation is not a new concept. Foam plastic insulating sheathing has been successfully used in this application for more than 50 years. – Foam sheathing has been used as continuous insulation for low-slope roofs since the 1940’s (~4-6 R/in) – Wall applications of continuous insulation saw increased interest after the 1970’s oil crisis

Role of CI and Various Requirements for Appropriate Use

Foam Plastic Insulating Sheathing (FPIS) Expanded Polystyrene (EPS), ASTM C578ASTM C578 Extruded Polystyrene (XPS), ASTM C578ASTM C578 Polyisocyanurate (Polyiso), ASTM C1289ASTM C1289

R-value per Inch Consult with FPIS manufacturer for specific values. Values shown are representative minimum values.

Water Resistance

Moisture Sorption Comparison XPS, EPS, and Polyiso all have a lower tendency to adsorb moisture than many other common building materials.

Durability Foam Plastic Insulating Sheathing (FPIS) – Does not rot, decay or corrode – Not food for termites – Can be used to protect moisture sensitive sheathing and framing materials Other wall sheathing – May be prone to moisture damage without adequate protection

Wall Applications Adaptable to a variety of exterior wall construction types, cladding types, and building types

Wall Functions of CI Continuous Thermal Insulation (CI) Water Resistive Barrier (WRB) Air Barrier (AB) Water Vapor Control (WVC) – The code compliant application of the above functions will be covered later in this presentation

Going beyond minimum code with CI Building Science Corporation NIST Net Zero Energy Research Home Zero Energy WRB AB WVC

Topical Resources for Parts 2 & 3 TopicResource (link) U-factorhttp://appliedbuildingtech.com/calculator.html FireTER No TER No , TER No , TER No TER No TER No BracingTER No (not online yet) Air BarrierTER No WRBTER No (not online yet) Vapor ControlTER No (not online yet) Wind PressureANSI/SBCA FS DetailingTER No Air-space R- value Tech Matters - Energy Code Compliance: Thermal Resistance of Air Spaces Behind Exterior Wall Coverings TermitesTech Matters – Analysis of and Recommended Actions for Termite Related Code Change Proposals for the 2012 IBC & IRC Vinyl Siding Over Foam TER No TER No (pending updates)