A cold roof refers to the type of roof that has the insulation layer installed between or under the rafters. Because of where the insulation layer is located, this is made so that the existing living space right below the roof is kept warm and insulated, whereas the roof and all supporting structures above the insulation is “cold” or closer to the external temperature.
When referring to cold or hot roofs, the terms actually determine the type of insulation system installed. A cold roof can either be ventilated or not ventilated. Unventilated cold roofs, however, require the use of a breathable type of membrane installed in between the insulation layer and the roof structure. Ventilation for this type of roofing is highly recommended to prevent moisture forming from condensation. Without a proper ventilation system, the warm air from inside the home can go through the ceiling and condense in the cool roof space. When this happens, moisture may start to form and cause leaking, and other forms of water damage to the internal structure of the roof. Leaving some space between the roof deck and the insulation layer is one way to provide ventilation.
An example for a hot roof is a 4 Ply Built up Roof, Also known as “tar and gravel” type roofs, on the other hand, a Built-Up Roofing System (BUR) is installed through a process of laying down alternate layers of both asphalt and tar, along with reinforced fabrics that provide a support system for the roof.
The lack of an exterior insulation layer makes the cold roof’s roof deck, shingles, rafters, and other structures similar in temperature to the external environment. This is a preferred insulation system for homes in Yonkers NY or any city with a cool climate. Cold roofs effectively keep the internal temperature of a home warm.
Flat roofs used a cold roof type of insulation system more commonly when it is to be implemented on the initial installation. Unfortunately, putting up a cold roof system on an existing flat roof can be troublesome. This is because the entire roof deck and supporting structures need to be removed in order to place the insulation layer. Overall, it can be easy to put up a cold roof insulation system if you are first creating the flat roof, but if installed when an existing roof is in place, it can take a lot of time and money.
A main factor in deciding whether to have a cold or hot roof type of insulation system for your home is the location. Cold roofs are a more practical option for areas with cooler climates. Here are a few specific reasons why cold roofs are more preferable for roofing in Yonkers NY.
Snowfall during winter can cause a build-up of snow on the top of your roof. Hot roofs retain the internal warmer temperatures and are likely to cause the snow to melt. Melted snow can go down your roof and come in contact with roof edges that are likely to be cooler than the roof panels. This can cause the melted snow to freeze over or form a cool slush that stays on top of the roof. This can be extremely detrimental to your roof since the slush, snow, or water that gets trapped can cause damage to roof shingles or tiles. A cold roof gets cooler during the winter and is not likely to cause any snow melting or ice dam formation.
Cold roofs usually have a good ventilation system that accompanies it. Without proper ventilation, hot roofs are more prone to condensation. When too much damp air has condensed under your roof, you might start to see leaks or water damage.
Because cold roofs create a layer that separates the roof and the internal home space, heating for your home is limited only up to that insulating layer. Whereas, with hot roofs, you end up having to heat your entire roof structure as well.
Cold and hot roofs each have their own advantages and disadvantages. Depending on the style and architectural design of the home, either could be the best fit. However, cold roofs can be more difficult to install when an existing roof is in place. Hot roofs, however, have an insulation layer that can be easily and simply put up on the top surface of the roof. This makes the installation process for hot roofs a lot simpler than cold roofs.
When using a cold roof system, property owners need to be certain that the roofer is able to provide good ventilation. Hudson Remodeling Contractors make sure that adequate space is set up between the insulation and the roof deck to prevent problems from condensation.
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