There are important layers between the soffit and your attic.
Vented vs non vented roof.
However the designs need to be climate sensitive.
Control airflow install at least 1 in.
One may ask that given the value of the air flow in the attic why would anyone choose non vented.
In high wind regions particularly in coastal areas wind driven rain is a problem with vented roof assemblies.
There are traditionally four main reasons for venting a roof.
Or 6 mm vented airspace should be installed between the roofing and the underlayment.
A box roof vent but it s still non mechanical so you will not need to spend money on electrical issues or failures in the system.
It has the ability to work with vaulted ceilings and you only need one of them to get the job done for ventilation as compared to multiple box vents.
Control construction moisture content with tenting or temporary roofing when necessary.
Moisture content in roof structure must be less than 18 prior to covering.
Removing moisture from roof cavities structural members sheathing and insulation.
Control of ice dams moisture accumulation and heat gain can be successfully addressed by both vented and unvented attic or roof design.
Some roof structures do not require the air to flow from the soffits.
It is the more expensive vs.
Enhancing roofing material life span by reducing sheathing temperature.
Basically the term cold roof refers to a traditional roof or vented roof while hot roof refers to a roof that is not ventilated and which has foam insulation attached directly to the roof sheathing.
Both vented and unvented attic roof designs can be used in all hygro thermal regions.
Controlling ice damming by keeping the roof cold.
Learn the difference between vented soffit and non vented soffit.
You ll find insulation and a.
If wood shingles or shakes are used a layer of drainage mat e g.
Because the drying capacity of unvented roof assemblies is inherently lower than vented ones it is especially critical to control built in moisture during construction.
Additionally during high wind events vented soffit collapse leads to building pressurization and window blowout and roof loss due to increased uplift.
25 mm of ccspf against the underside of the roof deck to prevent air leakage through the roof assembly and to prevent moist indoor.
The choice of the venting approach is up to the designer.
In this case you can learn a lot from foam tech s article vented vs.
Non vented soffits are the same panels but they are missing the holes or screens that are found often in plywood soffit that allow air into the roof.
Joseph lstiburek from building science corporation.
