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Guiding Principles for Installation of Exterior Windows and Doors R. Christopher Mathis ASTM, October 23, 2006
Recap Ø Previous recommendations for: q Structure q Work effort q Scientific back-up q Customer focus A Two Slide Summary from the presentations last ASTM meeting – April 2006
Previous Recommendations (1) Ø Divide and Conquer q Break the “Principles” out into a stand alone document. Others parts also into stand alone documents. Common style. Minimize repetition. Ø Work on it Here q Do it at ASTM versus in multiple organizations and places. Work to the common good.
Previous Recommendations (2) Ø Build a Scientific Foundation q Recommendations based on data – not speculation. Publish lab test results, field test results. q KNOW the boundary conditions/limits Ø Plan for Customers q Know WHO each part is written for. Focus on new construction first. Focus on the specification community first.
Some Customers Ø Standards Writers q Architects q Specifiers Ø Builders and Remodelers q “How To” training aids q What a good job looks like q What a good job does Ø Code Officials q Possibly, or another document specifically focusing on delivered performance compliance It is CRITICALLY important to know the limits of each document’s knowledge base. Do NOT extend any recommendations beyond the substantiating data we have that backs them up! Plan to prevent their misuse!
New Organization Plan From the Summer Interim Meeting
Now, on to The Guiding Principles
The Guiding Principles We didn’t get “divine” guidance, so we had to do the best we could with our small brains…
Governing Concepts Ø Principles-based q Focus on the Goals, NOT the details of “how” ü How goes into other documents Ø Simple q Easy for the common installer, builder, user to understand
GP Scope Ø Suitability for Use q Product must… Ø Preparation q Wall must… Ø Installation Basics q Square, plumb, level, anchored… Ø Integration q System must…
1. Suitability for Use Ø The Product Must: q Meet the requirements of the code ü Air, water, structural, energy, impact, etc. q Meet the requirements of its intended use ü Where in the wall (mid-wall versus corners) ü Where in the building (low versus high) ü Type of building (house versus hospital) ü Type of exposure (protected versus exposed) ü Where in the climate zone (wind/rain exposures) A lot of this is included in the DP rating…
Design Pressure Ratings Six basic elements are used to calculate design pressure ratings • Wind speed • Exposure • Importance factor • Mean roof height • Unit size • Wall location Wind speed Wall Zone Importance factor (building category) 30’ Exposure (B or C) Mean roof height Unit Size
What Does “Suitability” Mean? Ø You have to FIRST select the right window for the job! q Know the Code requirements q Know the DP ratings needed for the specific application and location Gotta know these things before you can even BEGIN to make installation decisions!
Location Matters! And these wind speed issues are NOT limited to Coastal conditions! Wind Zone 150 mph 140 mph 130 mph 120 mph 110 mph 100 mph 90 mph
Suitability and Water Exposure Ø Make sure the PRODUCT is suitable for the expected water exposure Ø Make sure the WALL SYSTEM is suitable for the expected water exposure Gotta know these things before you can even BEGIN to make suitable installation decisions!
2. Preparation Ø The wall must be APPROPRIATE for the window selected q Structurally, water management, material compatibility, etc. Ø The wall must be READY for the window selected q Proper framing, square, level, etc. q Dry? Yes, we know this is not a standard on how to build walls… But we can’t properly install a window if the WALL isn’t ready!
Wait a Minute… Ø I thought we were here to discuss WINDOW INSTALLATION? Ø Yes, however we MUST address “suitability” and “preparation” first, or we can never hope to have a proper and performing installation (1) Right product for the job, and (2) A wall that is ready for the product
3. Installation Basics Ø More than just “water management” q “Square, Plumb, Level” q Anchored ü Appropriate for the application and load q Integrated ALL are required to get ANY of the desired performance…
4. Integrated Ø Was is Integrated? q Appropriate for the wall system planned q Appropriate for the water management system planned q Successfully integrated with the wall structural and water management systems Remember: You must KNOW what water management approach is planned BEFORE trying to install the window…
Principles of Water Management Ø Deflection q Why we have shingles and siding… Ø Drainage q Why we have air spaces and drainage planes Ø Drying q Why we don’t want to trap moisture in walls Ø Durability q How long is this supposed to last? Jim K’s list…
More on Water Management Ø How much water do I have to manage? Ø Then, TWO choices: (1) DRAIN IT (2) BLOCK IT BOTH are tough to do right and well… Choices depend on the window, wall, wind and rain exposure, and risk tolerance…
“Drain It” Principles Ø Gravity is our friend q And it’s the LAW! Ø Direct the Water! q Down and out q Many opportunities to direct the water q Must work with overall water management plan and system Ø Give the water a place to go! Ø “Be the raindrop” q Horizontal or vertical furring? q How big is that crack? q Will the wind find this hole? Don’t expect the window to work if the wall doesn’t…
“Block It” Principles Ø Submarine concept Ø Small holes matter Ø Wall system must be: q Sealed q Continuous q Robust q Impervious to water Ø Everything must be “compatible” q Gotta stick together q For a long time q In a lot of conditions ü Hot Temperatures ü Cold Temperatures ü Rain, Snow, Sleet ü Dirt, Mud, Dust And if you think you can DO this, I have a bridge in Brooklyn I’m trying to sell…
Where Do We Go From Here? Ø New Text on “Guiding Principles” Ø Additional refinement to other Work Tasks? q Wall Standards ü Masonry, wood, etc. q Supporting Standards ü Flashing, sealants, anchors, etc.
Organization Plan From the Summer Interim Meeting
Revisions Underway Guiding Principles Suitability Preparation Fundamentals Integration Product Selection, Intended Use, Air, Water, Structural, Thermal, Wind Exposure, Code, Climate, etc. Wall basics, water management system to be employed, labor training and skills, material protection, etc. Square, Plumb, Level, Anchored, Integrated – each applied to the window and wall system being employed Integration with the wall/roof water management system planned, material compatibility, construction scheduling, etc.
Other Standards Will Cover… Wall Standards Wood Frame Structural basics, Water management basics, window integration plan basics Metal Frame Structural basics, Water management basics, window integration plan basics SIPS Structural basics, Water management basics, window integration plan basics Other Structural basics, Water management basics, window integration plan basics
Additional Work in Development Supporting Standards Flashing Material basics, operational classes, limitations of use, best practice, etc. Sealants Material basics, operational classes, limitations of use, best practice, etc. Anchoring Material basics, operational classes, limitations of use, best practice, etc. Other Material basics, operational classes, limitations of use, best practice, etc.
Slightly Revised Org Chart
Water Management Standards? “Drain It” Standard Fundamentals of water drainage, construction techniques that ensure drainage, minimum air space requirements, impediments to draining, test methods to assess drainage performance, inspection to ensure drainage, durability issues, flashing integration, sealant usage, common problems, performance risks, etc. “Block It” Standard Fundamentals of barrier systems, construction techniques that ensure barriers, minimum barrier requirements, impediments to barrier implementation, test methods to assess barrier performance, inspection to determine compliance, durability issues, common problems, performance risks, etc. Is this “Application of the Guiding Principles”?
Guiding Principles Objectives, Suitability, Preparation, Fundamentals, Integration Windows Types, materials, Walls Structural, materials, GP Applications General “How To” basics, for all Ancillary Materials, best Application “Principles”, selection criteria, best practices, options, risks, selection criteria, best practice, applications and situations and practice, limitations, performance etc. limitations, risks, etc. performance attributes risks, etc. specification guidance, etc. Flanged Non-flanged Wood Frame Drain it basics Masonry Types Other window types Block it basics Metal Frame Replacement Site Built Water Management Basics SIPS Other wall and system types Air Sealing Flashing Sealants Anchoring Application Objectives Thermal Performance and Practices Components, Shimming Other Standards Testing (lab, field) Testing Inspection Other supporting stds. Systems Integration
Guiding Principles Design Objectives, Suitability, Preparation, Fundamentals, Integration Windows Types, materials, selection criteria, performance etc. Flanged Non-flanged Walls Structural, materials, best practice, limitations, risks, etc. Wood Frame GP Applications Ancillary General “How To” basics, for all applications and situations and performance attributes Materials, best practice, limitations, risks, etc. Water Management Basics Drain it basics Block it basics Metal Frame Air Sealing Replacement Masonry Site Built SIPS Testing (lab, field) Other window types Other wall and system types Inspection Flashing Sealants Anchoring Thermal Performance Sequencing Systems Integration Shimming Testing Other supporting stds.
DRAFT Standard Guideline for Installation of Exterior Windows, Doors and Skylights INTRODUCTION This document defines the Guiding Principles for the installation of windows, doors and skylights. It is intended to provide an overall picture of the requirements and complexity associated with the successful integration of these products into wall systems. As a Guideline, it covers key issues that installers should consider when selecting a window, door or skylight for a given application. It addresses issues such as selecting products that are suitable for a particular application, the types of wall and materials preparations that should be considered when installing these products, guidance on installation basics that are almost universally applicable for these products, and key issues of proper integration – again, applicable to almost any wall system. The elements of this Guideline have been developed by general consensus. Where applicable, experimentation and testing have been conducted to substantiate the recommendations. In the absence of testing, professional judgment and the advice of subject matter experts have been relied upon.
(continued) This document is intended to work in concert with other ASTM documents that are closely related to the many varied issues involved in proper window, door and skylight installation. It will refer the user to numerous other standards for topic-specific guidelines and additional important considerations - such as wood frame wall considerations, flashing material considerations, climate considerations, etc. The Guideline also includes examples of the Guiding Principles in practice – with specific recommendations to the designer or installer regarding achieving on-site, installed performance equal to the expectations and product performance claims. As such, rainwater management principles and air sealing principles are discussed in some detail. (Note: Rainwater leakage has been the leading reason for dissatisfaction of building owners with performance of fenestration installations. For this reason, This Guideline places greater emphasis on preventing or limiting rainwater leakage than on any other single performance characteristic. ) The Guideline also offers guidance on quality assurance, on-site inspection, testing and code compliance.