Exterior Building Materials & Detailing
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1 Exterior Building Materials & Detailing Marquam George Marquam George LLC Juneau, Alaska Barriers to? V.1950 Air only Vapor only Water only Air & Water 1
2 V.1990 V.2005 Detailing Includes Simple roof geometries Wide overhangs Excellent flashings Inspection, maintenance & reparability Base splash Maybe, reading the instructions And, don t be cavalier about what you re installing that you can t see/inspect later 2
3 There are two types of windows, windows that leak now, and windows that will leak 3
4 Values of Vapor Permeance Since the 1940s perm was the unit selected for use in the USA. One perm represents 1 grain of water per hour per square foot of surface material per inch of mercury difference. Vapor Permeability Classes Class l: Vapor Barriers 1 perm or less Class ll: Vapor Retarders more than 1 perm and less than 10 perms Class lll: Breathable 10 perms or more HDD 4515 CDD 345 RAIN 37.5 HDD CDD Ø RAIN 15.9 Question? Portland HDD 4611 CDD 167 RAIN 38 Anchorage HDD 5674 CDD 508 RAIN 7.5 HDD 1350 CDD 4162 RAIN 7.7 How many vapor retarders are in your assemblies? Seattle HDD 2749 CDD 1237 RAIN 17.5 Reno HDD 5861 CDD 754 RAIN 12.1 Phoenix How many air barriers are in your assemblies? Boise Sacramento 4
5 Plywood (CDX) Material functions: Air flow retarder Vapor flow retarder Neither Both R 0.5 Perm 0.75 Function:? Oriented Strand Board (OSB) Asphalt Fiberboard R 0.5 Perm 0.75 Function:? R 1.2 Perm 21 Function:? Vinyl Wallpaper R703.2 Water Resistive Barrier One layer of No. 15 asphalt felt, free from holes or breaks, complying with ASTM D226 for Type 1 felt or other approved water resistive barrier shall be applied over studs or sheathing of all exterior walls. International Residential Code 5
6 ASTM¹ D779 The boat test: involves making a folded up boat from the test material, placing it in water, and timing how long it takes the indicator dye to show up. AATCC² The hydrostatic pressure test: It s a high pressure test, a full 22 of water column is roughly equivalent to a hurricane force wind of more than 200 mph. CCMC³ The water ponding resistance test: 1 of water is placed in a bowl shaped sample of the wrap. The water cannot pass through the bowl for at least 2 hours. ¹American Society of Testing & Materials ²American Assoc. of Textile Chemists & Colorists ³Canadian Construction Materials Center 6
7 Exterior Objective 1. Reduce the moisture load on the cladding. 2. Minimize the number and size of holes in the cladding. 3. Manage the driving forces across the cladding. Inner Objective 1. To intercept all water that passes through the cladding. 2. To dissipate the water effectively to the exterior of the structure. 7
8 #15 Asphalt Felt Paper 8
9 4 Should Weather Barriers be: 15 3/8 Resistant to air movement? Continuous? Seam sealed? Strong & durable? Water tight? Vapor open? Drainage if the moisture cannot be drained, it will be stored draining can remove the greatest amount of water in the shortest time is a drainage path provided? 9
10 Product Perm UV Resistance Tyvek HW days Tyvek CD days Typar days Raindrop days Classic months ProWrap months Gorilla days Vaproshield days #15 felt 10 CSD 10
11 Solar Affected Side Average Temp 45 F Average RH 74% Max RH 78% Min RH 70% Non Solar Affected Side Average Temp 52 F Average RH 50% Max RH 58% Min RH 41% 11
12 Ventilated Cavities Provides a capillary break for water penetration into the wall cavity Provides an effective drainage space Reduces direct moisture bridges Allows for the removal of moisture that might of penetrated the cladding Can permit pressure equalization 12
13 Will This Work? Appleton Supply Co. Compartmentalize & Drainage for Vertical Claddings 13
14 Air Barrier & Drainage Planes? 14
15 15
16 Capillary Water will not flow by capillary suction from a matrix of small pores to a matrix of larger pores. More care should actually be in the preparation of the soil at the base of the excavation into which the drain will be placed. Extruded Polystyrene (XPS). R 5 per inch Perm Function:? 16
17 Expanded Polystyrene (EPS) R 4 per inch* Perm Function:? Polyisocyanurate Insulation R 6.5 per inch* Perm Depends on facing; Function:? Source: Building Science Corp. 17
18 Global Warming Potential Roxul R 4 per inch Perm 30.9 Function? 18
19 Foil faced Bubble Wrap Skärbord 19
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25 Butyl Rubber Synthetic rubber developed in the 1940 s Air tight and gas impermeable Excellent moisture resistance, provides a permanent, flexible, watertight seal Good weathering and ozone resistance Provides aggressive chemical and mechanical adhesion to a variety of clean, dry surfaces SBS Asphalt By-product of petroleum refining Composition is variable depending on crude oil source Sensitive to oxidative degradation of low molecular weight components due to heat and UV Not compatible with some caulking chemistries Butyl Rubber Formulated for extreme environments: Remains highly stable and intact in heat up to 180F Exceptional cold weather adhesion Does not delaminate or stain substrates Contains no solvents or VOCs Compatible with some caulking chemistries SBS Asphalt Asphalt adhesives flow at high temperatures Will become brittle at cold temperatures May contain solvents and VOCs, becoming brittle over time resulting in breakage and loss of adhesive properties Seal integrity susceptible to water and air leaks due to adhesive breakdown May stain substrates ABS pipe has a higher rate of expansion and contraction than other plastic or metallic pipes. the lineal expansion is 1.34 inches per 20 feet of pipe length with a 100⁰F temperature change. 25
26 Wear are they? 26
27 Design & Construction Rules Construct ability Inspect ability Repair ability Dr. Joseph Lstiburek Building Science Corp mind the gap eh?topic=doctypes/insights Resources Joseph Lstiburek, Builders Guides William Rose, Water in Buildings Heinz Trechsel, Mark Bomberg, Editors, Moisture Control in Buildings 2 nd edition 27
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