What is a warm deck roof?
What are the two types of flat roofs?
Is ventilation required on an inverted roof?
What is the difference between warm deck and cold deck roof?
Cold roof: As the majority of the insulation is between the rafters, the overall build-up of the roof is often less. Warm roof: The insulation is laid above the substrate layer so the overall roof construction is generally deeper.
Is a cold roof better than a warm roof?
A warm roof is the easiest and most cost effective type of insulation and is an ideal choice for pitched roofs. On some flat roof extensions and balconies, a warm roof would increase the height and isn't possible, in this scenario you should choose a cold roof insulation.
What is a warm roof deck?
Warm deck roof: The insulation in a warm deck roof is installed immediately below the roof membrane on top of the roof deck, usually with a vapour control layer underneath the insulation.
What is a cold roof space?
A cold roof is the most common roof construction often in the form of an uninhabited storage space. Insulation is laid at ceiling joist level, leaving the roof space relatively colder than the accommodation below.
Do cold roofs need ventilation?
Cold deck roof construction The cold deck roof as shown above has the insulation at ceiling level and must have a ventilated cavity of at least 50mm. The cavity must be ventilated on two opposing sides by a continuous ventilation gap of 25mm.
Does a cold roof need a vapour barrier?
Sadly, it's often the way – out of sight, out of mind, but the humble VCL is actually a very important part of the roof build-up. Be it a cold or warm roof construction, the primary function of a VCL is to keep warm moist air from inside the building – inside the building.
What is cold roof designed for?
By creating a constant flow of cold air above the insulation but below the roofing material cold air is allowed to circulate, a cold roof system prevents snow on the roof from melting when the outside temperature is 22 degrees Fahrenheit or colder.
Where are cold roofs used?
Cold roof insulation is more commonly used for flat roofing because it's a relatively easy process. However, cold roof insulation on an existing flat roof system is not simple.
Does a warm deck roof need ventilation?
A warm flat roof usually does not require ventilation. What space do I need to allow for the ventilation? To ensure sufficient ventilation, enough space must be provided to allow for the movement of air, preventing the risk of condensation forming within the roof.
Can you convert cold roof to warm roof?
It is often preferable to convert an existing cold roof to a warm roof construction, as this greatly reduces the problem of thermal bridging.
How much insulation should be in a cold roof?
An uninsulated flat roof has a U-Value of around 1.5 W/m2K. When insulating one, you're aiming for a value of 0.25 W/m2K or less. To achieve this, you should insulate your flat roof with insulation boards totalling around 150mm thickness.
How do you insulate a cold flat roof?
How do you insulate a flat roof?Lay 12mm of plywood or OSB board across the timber joists as a base for the flat roof build-up.Install a vapour control layer to reduce the risk of condensation and moisture compromising the flat roof structure.More items...
How much does a cold roof cost?
According to the Environmental Protection Agency, the price of a cool roof coating can range from $0.75 to $3.00 per square foot. For a home with a typical 1,500 square foot roof, installation costs can add up to between $1,600 and upwards of $6,500.
How much more efficient is a warm roof?
The warm roof can come in many different styles and with different materials. We spoke to Warmer Roof in Somerset; they use a timber build for their warm roof and they tell us “Our Warmer Roof is at least 5 times more energy-efficient than traditional glazed conservatory roofs.
What is cold roof designed for?
By creating a constant flow of cold air above the insulation but below the roofing material cold air is allowed to circulate, a cold roof system prevents snow on the roof from melting when the outside temperature is 22 degrees Fahrenheit or colder.
How much insulation should be in a cold roof?
When insulating one, you're aiming for a value of 0.25 W/m2K or less. To achieve this, you should insulate your flat roof with insulation boards totalling around 150mm thickness.
What is a warm deck roof?
The insulation in a warm deck roof is installed immediately below the roof membrane on top of the roof deck, usually with a vapour control layer underneath the insulation. Contrasted with the cold deck roof, this construction has a much lower risk of condensation as the void will be of a comparable temperature to the roof. Ventilation is also not required with this type as the design works by conserving heat. Furthermore, an Inverted roof is a different type of warm deck roof, where the insulation is installed above the membrane and so no vapour control is needed. This then means that the roof void or deck are at a similar temperature to the room below.
What are the two types of flat roofs?
There are two main types of flat roof – cold deck roof and warm deck roofs, do you know the difference?
Is ventilation required on an inverted roof?
Ventilation is also not required with this type as the design works by conserving heat. Furthermore, an Inverted roof is a different type of warm deck roof, where the insulation is installed above the membrane and so no vapour control is needed.
What is a warm deck roof?
The insulation in a warm deck roof is installed immediately below the roof membrane on top of the roof deck, usually with a vapour control layer underneath the insulation. Contrasted with the cold deck roof, this construction has a much lower risk of condensation as the void will be of a comparable temperature to the roof. Ventilation is also not required with this type as the design works by conserving heat. Furthermore, an Inverted roof is a different type of warm deck roof, where the insulation is installed above the membrane and so no vapour control is needed. This then means that the roof void or deck are at a similar temperature to the room below.
What are the two types of flat roofs?
There are two main types of flat roof – cold deck roof and warm deck roofs, do you know the difference?
Is ventilation required on an inverted roof?
Ventilation is also not required with this type as the design works by conserving heat. Furthermore, an Inverted roof is a different type of warm deck roof, where the insulation is installed above the membrane and so no vapour control is needed.
