WHAT IS A BATTEN SYSTEM, SITTING OVER SHEATHING VENTILATION?
In a batten system, the wooden batten is attached to the ceiling over the siding opening, either horizontally or in both directions in a grid pattern called a counter-batten system. The batten then forms the attachment point for roofing materials such as metal tile Canopy.
The installation of metal tile roofs over a lamellar system allows air to flow under the tiles and thus ensures better ventilation. The air gap resulting from a lamellar system works well for a cool ceiling design and for heat dissipation. By ventilating the cladding, greater energy efficiency is achieved. The air space under the metal tile roof heats up, rises up the ridge, and escapes before it can enter the attic. This movement of air helps keep the house cooler.
The Oakridge National Lab recently produced a report titled The Tradeoff Between Sun Reflection and Shroud Ventilation for Metal Roofs in Residential and Commercial Buildings. From this summary report, it appears that the air space under the metal shingle roof is better in a louver system than in an asphalt shingle with a cool roof. He explains that this air gap heats up, rises towards the ridge, and escapes before it can get to the attic. This movement of air keeps the house cooler than even the best of cold asphalt shingles.
Perhaps a surprising and certainly interesting finding from the report is that the darker the color of the metal roof, the faster the air moves, so for the ventilation above the cladding, a darker color works well as a clear one. The key to understanding how metal tiles create a cooling effect in a lamellar system is to look at the outside temperature and how it affects heat transfer.
When the sun goes down, the temperature of the metal tile roof drops in line with the outside temperature. Using your car is an example that you can identify with. When the sun goes down on a hot sunny day, the temperature in your car cools down quickly, but you will find the streets and sidewalks stay hot well into the night. The same applies to metal tiles on slatted roofs. As the sun goes down, the temperature of the roof drops and the air between the louvers move to the crown and out of the system.
The metal tile roof on a lamellar system is also very effective at lower temperatures at night and in winter The air gap isolates the roof from the outside temperature The hot air in the air gap circulates to eaves and rakes to reduce the formation of ice. above. If you are using a Tricor metal clapboard, the back or bottom of the panels will be shiny and reflective. Reflects the heat down from the attic exit, helping to keep the house warmer in winter.
THE BENEFITS OF A BATTEN SYSTEM SITTING OVER SHEATHING VENTILATION
From what you have already read, you will have seen that the use of a batten system certainly has advantages over liner ventilation.
Here are some of the benefits of a batten system:
- Reduces the load on the HVAC system.
- Reduces the heat gain in the attic.
- Reduces ice damming.
- Reduces heat loss in winter and heat gain in summer.
- Insulation can be installed between the battens above the deck to increase thermal insulation and reduce energy consumption.
- SOL-R-Skin combines the properties of a roof substrate with the thermal and fire-resistant properties of thermal insulation (one product that replaces two).
BATTEN SYSTEM VS DIRECT TO DECK
Battens systems have 1 ½ “of continuous air space from eaves to rest so that hot air can escape and not enter the attic, compared to direct deck profiles that are only 1” and lead to nothing. The lamellar systems only have 47 fasteners penetrating the base layer per square, while others have direct-to-deck profiles up to 200.
Battens systems have higher wind lift rates than direct-to-deck profiles because the metal tile roof at the top of the panel is nailed vertically into the roof, which enables very high wind lift rates. They are attached from top to bottom. The technology for nose clip products has been around since 1957 and the technology has proven itself in all climates around the world.
Maintaining a batten system is easier than installing it directly on the deck, as batten profiles like our Craftsman Shake profile at Tilcor are very walkable and metal clapboard panels can be replaced, repaired, or simply removed anywhere on the roof to add solar panels. O Profiles that run directly to the deck require panels to be pulled down from the ridge to repair, replace or remove a panel to add solar panels