
Residential Comfort & Energy EfficiencyFriday, August 28 2020
Get to the Root of the ProblemA doctor always wants to get the the source of the issue. Let's consider a lower back ache as an example. If you hurt your lower back chances are the doctor will give you a muscle relaxer for the symptoms. A good doctor will likely give you a pamphlet on core strengthening exercises to get to the root of the problem. Specialized Contractor Needed for Damp BasementsSome issues inside the home can be confusing and confounding for many contractors. A damp basement and high humidity are hard to solve. As a homeowner, knowing where to turn for help might be difficult to figure out. Making matter worse, getting the wrong contractor can waste time or cost extra money. Indoor Humidity and SeasonalityThe recommended indoor humidity level - year round - is between 40-60%. To get a handle on indoor humidity, the first thing to understand is the seasonality of indoor humidity. In the summer the air outside is hot, humid and sticky in Maryland. We run our dehumidifiers in the basement. If you have not gotten around to attaching the hose most likely you are dumping water on the regular. This effort pulls extra moisture from the air. In the winter everyone talks about the Polar Vortex. Aside from being very cold, the Polar Vortex is also very dry! In winter our hands are cracking, lips get chapped and we need to introduce moisture into the inside air. In this case a humidifier is used. So, I will be clear. High indoor humidity is more of a summer issue. Home Energy AuditThe key to solving a high indoor humidity issue is to look at it like a doctor. We need to find the source of the humidity in the air. We need to attack the problem. Where is the humid air getting in? Waterproofing will not completely solve the issue. Industrial strength dehumidifers are the muscle relaxer and treat only the symptom. Having your home evaluated by a certified Building Analyst (BA) is a great way to identify home air leakage. It is important to understand that air leakage works both ways. Not only does air leak out of a house (exfiltration) air also leaks in (infiltration). A blower door test can uncover air leakage points around a house. Working with a Building Analyst is a great place to start for a damp basement due to a high indoor humidity issue. Saturday, August 15 2020
Why does Mold Form on Plywood?Typically, condensation in the attic starts due to a moisture issue created by introducing two completely different air masses. Here are the two possible reasons this problem is happening in your attic. 1. No air sealing at the attic floor to stop warm, conditioned air from escaping into the attic (warm air/ winter issue) coupled with a lack of adequate attic ventilation creating conditions that are right for condensation that adheres to the plywood and eventually forms mold. 2. In summer, a leaking AC HVAC duct in an attic and other HVAC-related inefficiencies can allow air to seep out and interact with the hot, humid attic air, mainly if the attic is not well vented. If you find this helpful, check out more info on my YouTube Channel @hometrustremodeling Warm Air Exfiltration - Winter IssueSigns that you have an attic moisture issue problem during cold months can sometimes be seen on the plywood.
Winter Problems - What to Look out ForFrozen droplets on the tips of nails and hurricane clips signify that warm, humid air is migrating from inside the home into the attic and settling in the wrong places. But, how is the warm, humid air getting into this attic? The usual suspects...can lights and top plates! Recessed light thermography taken at the attic floor reveals heat from inside the home escaping into the attic.
Top plates are also leaky spots if not appropriately air-sealed. Top plates in the attic will exist above the hallway, between rooms, and other areas separated by a wall.
Summer Condensation - How it Formed in This Attic
At first, when I got up in the attic, I could see the stains. It was apparent quickly that there was an issue beyond what I usually see. I have been in many attics and seen a lot of roof sheathing over the years. I was not exactly sure about this one at first. I have not had a mold case. Overall, is is pretty rare, at least in Maryland. At first, I considered the possible interaction of the cool conditioned air in the living space below and the warm, humid attic air. Maybe I could find a large opening or bypass where the air interacted, but why would be so high up? Then I turned around. I saw a huge HVAC supply duct lying completely undressed and the picture was getting clearer. Summer Moisture - 4 Things to Lookout ForHere is the recipe for mildew and mold growth on the plywood in warmer months: 1. HVAC Ducts *Second HVAC system located in the attic or crawl space. 2. HVAC System Size *The second HVAC system is improperly sized. 3. Poor thermostat location. *The thermostat is located in an area reported to be a "hot spot" on the floor so the machine was running longer. 4. Poor Ventilation *Improper baffle placement. A baffle is supposed to act as a channel for the open soffit intake below. The soffit opening is covered with insulation, not allowing good flow. Here is what it is supposed to look like. How to Remove Mold from Attic PlywoodAnswer: Control the humidity and the mold growth disappears.Here are the steps recommended to solve this issue in the long term. 1. Remove the insulation around the soffit/eave areas - the entire perimeter 2. Reinstall baffles at the eaves to promote the best possible organic attic ventilation. 3. Re-position the insulation so as not to cover the openings. 4. Seal the duct seams and tightly insulate the supply plenum (central AC duct) to eliminate leakage (lost energy) into the attic.
________________ Written by Eric Gans Do you have something going on around the house? Maybe my YouTube Channel can help. YouTube Channel @hometrustremodeling
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