Recently on a commercial backflow preventer installation job, the customer asked me, “Do I need a thermal expansion tank? We have not painted since then. If you’re observing green growth, this is likely due to mold growth. Thermal Tracking Thats a cool phrase, get it cool and thermal! Tankless water heaters (TWH) can cause thermal expansion too. Dry arc tracking can occur without a liquid and may begin by the thermal degradation in the vicinity of a poor connection, such as that seen in Photo 1. This was a big addition, family room, Master Bedroom, about 1300 square feet. Thermal bridging is the movement of heat across an object that is more conductive than the materials around it. Ghosting is the slow buildup of air-borne dust, dirt, and soot particles on walls or ceilings. Another transverse crack caused by thermal contraction during cold weather. Thermal expansion is not limited to storage or tank type water heaters. Ghosting typically causes black, not great lines. The term thermal splitting or cracking is a bit of a misnomer as, in most cases, the result of thermal splitting is a tearing of the shingles. Erik North, the owner of Free Energy Maine, is an energy auditor and home performance specialist in Westbrook, Maine. Thermal bridging can be a major source of energy loss … Problem. The same conditions that cause ghosting (condensation, high humidity, etc.) Keep it in mind when thinking about the heat loss (and the heating bills) at your home. Asphalt, the material used to pave roads, can crack and degrade in extreme cold. The crack has subsequently been patched as a temporary fix. Anyway, in my house we did an addition about 12-13 years ago. Allows moisture infiltration, roughness. Possible Causes Photo 3 illustrates lab-induced dry arc tracking and wet arc tracking situations on a plug face and microswitch, respectively. The thermal conductivity of the materials passing through the insulation layer; The cross sectional area of the thermal bridge; How easily heat can get into and out of the thermal bridge which, in turn, depends on: The relative area and surface resistance of the surfaces of the thermal bridge facing the source of heat and those facing the heat sink Usually a type of thermal cracking. can also lead to mold growth. Also known as “ghost stains,” “bridging,” or “thermal tracking,” ghosting creates strange patterns along exterior walls and ceilings. Transverse asphalt cracking usually occurs when the asphalt is exposed to … Thermal bridging is one of the hidden heat-loss paths that a home energy audit can uncover. In this post, Mascon Inc. discusses what causes thermal splitting, and how it affects asphalt shingles. I previously touched on the consequences of not controlling thermal expansion, and this is an update to that post.. Thermal cracking in concrete and similar materials is a cause for concern in very cold environments, especially when the material is being used for structures such as bridges and buildings, where failure could cause a catastrophe. A large transverse crack caused by the pavement's contraction in cold weather. Thermal Splitting and Cracking. This crack has been sealed. The conductive material creates a path of least resistance for heat. Purchase a relative humidity gauge and try to keep the RH below 55%. What Causes Ghosting? In most major cities, transverse or thermal cracking in asphalt is a very common problem and a safety hazard because the roads are constantly in use; this is why it is important to hire companies that specialize in transverse crack repair in Toronto.. What Causes Transverse Cracking in Asphalt? Unmanaged, thermal throttling can have a big impact on performance. , about 1300 square feet in this post, Mascon Inc. discusses what causes thermal splitting, this... 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