Recently on a commercial backflow preventer installation job, the customer asked me, “Do I need a thermal expansion tank? Thermal bridging can be a major source of energy loss … The same conditions that cause ghosting (condensation, high humidity, etc.) 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. Photo 3 illustrates lab-induced dry arc tracking and wet arc tracking situations on a plug face and microswitch, respectively. Anyway, in my house we did an addition about 12-13 years ago. 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? This was a big addition, family room, Master Bedroom, about 1300 square feet. In this post, Mascon Inc. discusses what causes thermal splitting, and how it affects asphalt shingles. Thermal expansion is not limited to storage or tank type water heaters. Thermal Splitting and Cracking. Thermal bridging is the movement of heat across an object that is more conductive than the materials around it. Asphalt, the material used to pave roads, can crack and degrade in extreme cold. 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. Thermal bridging is one of the hidden heat-loss paths that a home energy audit can uncover. Tankless water heaters (TWH) can cause thermal expansion too. A large transverse crack caused by the pavement's contraction in cold weather. Keep it in mind when thinking about the heat loss (and the heating bills) at your home. If you’re observing green growth, this is likely due to mold growth. 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. Thermal Tracking Thats a cool phrase, get it cool and thermal! Purchase a relative humidity gauge and try to keep the RH below 55%. The conductive material creates a path of least resistance for heat. Unmanaged, thermal throttling can have a big impact on performance. Transverse asphalt cracking usually occurs when the asphalt is exposed to … Usually a type of thermal cracking. We have not painted since then. Allows moisture infiltration, roughness. Also known as “ghost stains,” “bridging,” or “thermal tracking,” ghosting creates strange patterns along exterior walls and ceilings. Erik North, the owner of Free Energy Maine, is an energy auditor and home performance specialist in Westbrook, Maine. 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 Possible Causes Ghosting is the slow buildup of air-borne dust, dirt, and soot particles on walls or ceilings. The crack has subsequently been patched as a temporary fix. I previously touched on the consequences of not controlling thermal expansion, and this is an update to that post.. What Causes Ghosting? Problem. Another transverse crack caused by thermal contraction during cold weather. This crack has been sealed. Ghosting typically causes black, not great lines. can also lead to mold growth.