Attic Condensation. Presented by: Joan Maisonneuve Technical Services
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1 Attic Condensation Presented by: Joan Maisonneuve Technical Services
2 Scope of the Presentation How does moisture get into the attic? Blowing snow Moisture from the outdoor air Moisture from side-vents Moisture transfer From the living space How to prevent it Air Sealing Humidity Control Ventilation Homeowner Education
3 Sources of Attic Moisture Doing the Detective Work
4 Moisture Source - Outdoor Air How Much Moisture Can Air Hold? ft 3 air + 21 C 500 ml 1000 ft 3 air 0 C 150 ml 1000 ft 3 air -30 C 5mL
5 Blowing Snow Attic vent location Wind How much is too much?
6 Outdoor Source: Moisture From Vents Furnace exhaust Hot water heater exhaust Gas fireplaces Vacuum exhaust
7
8 Air Leakage from the Living Space
9 Solutions: Part A Attic Venting
10 Reasons to Vent a Roof: 1. Enhance life span of the roofing material Remove heat from attic Cool underside of the shingles 2. Control ice damming Prevent heating of the underside of the roof sheathing 3. Promote drying 4. Control moisture accumulation Moving air deposits less moisture
11 Minimizing Blowing Snow Entry Locations of vents Not too close to the peak Opposite prevailing winds Vent Type Good internal baffles or screen Goose necks/whirly birds Eave Vents?
12 Roof Venting Assumptions The building envelope is tight; the amount of moisture in the attic is minimal Inlet and outlet areas are distributed evenly Side to side Top to bottom A flow exists Complexity of the roof Wind conditions Snow cover Covered vents The outside air is able to absorb moisture Temperature dependant Looking for moisture balance
13 What Drives Attic Ventilation? The Stack Affect Attic air heated by contact with a hot roof tends to rise. This is natural convection, which pulls cooler air from the soffit up towards the ridge. The steeper the roof pitch the better the stack affect works in particularly cold weather Wind Direction, Speed, Duration While higher wind speeds tend to increase attic ventilation, the relationship is a weak one: Ventilation rates at a given wind speed can vary by a factor of 10. Attic ventilation is only one part of the solution
14 Internal Framing Issues Compound roofs Roofs built in sections Roof sheathings blocks air movement in the attic between 2 sections of roof
15 Potential Vent Options Front and back soffit venting Gable end vents Traditional pancake vents, moving ventilators, installed near the eave Off peak vents
16 Front and Back Soffit Venting Can enough air be introduced with vented soffits to meet the Code? The 1 in 300 requirement The Code minimum 25% at the bottom of the space What are the issues with this solution? balanced intake and exhaust due to insulation height
17 Front and Back Soffit Venting Slots for Ventilation Dropped Gabel Truss
18 Gable End Vents
19 Air Intake Low on the Roof Off-peak air intake vents
20 Roof Meets a Wall Hip Vents
21 Powered Ventilation air intake should match air exhaust Check for low temp shut off Maintenance? When it quits working? Are they rated to work in cold temperatures?
22 Tests for Vents Miami Dade County Wind driven rain test 8.8-inches of water at 110 miles per hour ICC Wind driven snow tests Dust exposure test CAN3-A93-M Largely out of date
23 Ventilation Must be Balanced Every inch of air exhausted, must be balanced by providing the same or greater amount of air intake at the eaves or soffits.
24 Attic Ventilation and Cold Temperatures Accumulation/Drying It takes cold air a long time to pick up moisture when it is in solid form (frost or ice) Wind Icicle Attic ventilation is not usually enough to remove moisture at cold temperatures!
25 Solutions Part B: Air sealing
26 Indoor Sources Of Moisture New home Room humidifiers Cooking bathing, showers Plants Fish tanks Water features Family type
27 Humidifiers & Occupants 4 Occupants 1.3 gallons a day (5L) New Construction 1.3 gallons/18 months Flow-through Humidifiers 18 gallons (68 L) of moisture into the air each day
28 Frozen Moisture Math Exposed length of time + High Relative humidity of air leaking + Exposure to a dew point (cold surface) = Accumulation and build up
29 Moisture Transfer More moisture moves by air leakage than by diffusion
30 Seal Air Leakage into the Electrical plugs Envelope Air sealing of poly at window perimeter Vents to outside Joint in window/jamb extension Interior walls wiring chases
31 Why is There More Air Leakage Pressure at the ceiling (stack effect) Tighter Envelope buildings are easier to pressurize or depressurize at the Ceiling? Diagram from the CHBA Builders Manual
32 Unbalanced Ventilation Mechanical Systems
33 Aspirated Furnace Mechanical Systems
34 Sealed Combustion Mechanical Systems
35 Seal Air Leakage Points at the Attic hatch Bathroom fans Housings, ducting and connections Plumbing stacks Pot lights Chimneys Chases Ceiling
36
37
38 Proper Poly Laps
39
40
41 Find Hidden Leakage Points: Areas of Missing Vapour Barrier Small Framed Wall 2 Parallel walls
42 Check Bathroom Fans Moisture escapes at: connections between ducting and vent termination around the housing to ceiling joint
43 The Duct/Vent Connector Interface
44 Other Areas of Air Leakage Damage to the poly near a penetration Disconnected piping
45 Cantilever Over an Entry
46 Does Frost Always Result in a Leak to the Inside? Many times a melt does not result in a leak because: The water evaporates quickly; The water is absorbed by the attic framing, or insulation; Pools of water cannot find an opening to the interior; The path of water leads to the outside of the building.
47 Solutions: Part C Reduced Humidity Effective Interior Ventilation
48 Homeowner Responsibility As the temperature drops reduce humidity Turn down/off humidifier Use spot ventilation Use central ventilation more
49 Tighter Homes Need Better Average air change rates 3 Ach/hr Central Vent fans How are they interlocked? How much do they run? Passive and Active HRV s Are they effective? Are they balanced? Ventilation
50 Objections to Lower Humidity Wood Floor damage Short term reduction will not severely affect the floor Comfort/Health short term comfort or long term damage? Cost to run ventilation Use more effective fans Use timers, programmable for humidity or peak demand Short term cost versus long term damage
51 A Question of Balance Humidity conditions in the home Degree of air leakage from the home Degree of the warming Duration & severity of the cold weather
52 In Conclusion At Construction Design/discuss details for sealing known leakage sites with your trades Seal all penetrations no matter how small - especially at the ceiling Thoroughly inspect air barriers & penetrations before insulation Blower door test Balance attic air flow Improve interior ventilation operation After Possession Educate Homeowners on their role Turn down or off humidifier as temperature drops Run ventilation more as the temperature drops REMEMBER: There is conflict between indoor humidity for health and hardwood versus the potential for leaks with a severe stretch of cold weather
53 Resources Building sealing details and theory: Attic Ventilation and Moisture, 1993, CMHC Research Highlight Moisture Technician Course CHBA Builders Manual EEBA Builders Guide for a Cold Climate CMHC Building Solutions Book ASHRAE Handbook of Fundamentals Journal of Light Construction Building Science Corporation
54 Questions????
55
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