Roof ventilation system and method

A ventilated roof, comprising:

• a roof structural layer through which air is to be ventilated;
• a primary vent disposed in the structural layer to provide an air flow passage therethrough having a first venting performance;
• a plurality of tiles mounted on the structural layer to form a tile layer thereover and arranged to provide air flow passages between adjacent tiles having a combined second venting performance;
• and
• a secondary vent disposed in the tile layer to form an outer roofing layer therewith and having an air passage therethrough with a third venting performance smaller than the first venting performance, the outer roofing layer being in air flow communication with the primary vent to provide a venting air flow passage for venting said air.

A method for ventilating a roof, comprising the steps of:

• providing a roof structural layer through which air is to be ventilated;
• selecting a primary vent having a first venting performance;
• mounting the primary vent in the structural layer to provide an air flow passage therethrough;
• selecting a plurality of tiles;
• arranging the tiles on the structural layer to provide air flow passages between adjacent tiles;
• mounting the tiles on the structural layer to form a tile layer thereover having a combined second venting performance;
• selecting a secondary vent having an air passage therethrough with a third venting performance smaller than the first venting performance;
• and
• mounting the secondary vent in the tile layer to form an outer roofing layer therewith in air flow communication with the primary vent to provide a venting air flow passage for venting said air.

A ventilated roof, comprising:

• a roof structural layer through which air is to be ventilated from an attic;
• a primary vent disposed in the structural layer to provide an air flow passage therethrough having a first venting performance;
• a plurality of tiles mounted on the structural layer to form a tile layer thereover and arranged to provide air flow passages between adjacent tiles having a combined second venting performance;
• and
• a secondary vent disposed in the tile layer to form an outer roofing layer therewith and having an air passage therethrough with a third venting performance, the outer roofing layer being in air flow communication with the primary vent to provide a venting air flow passage having a fourth venting performance greater than the second venting performance for venting the air from the attic.

A method for ventilating a roof, comprising the steps of:

• providing a roof structural layer through which air is to be ventilated;
• selecting a primary vent having a first venting performance;
• mounting the primary vent in the structural layer to provide an air flow passage therethrough;
• selecting a plurality of tiles;
• arranging the tiles on the structural layer to provide air flow passages between adjacent tiles;
• mounting the tiles on the structural layer to form a tile layer thereover having a combined second venting performance;
• selecting a secondary vent having an air passage therethrough with a third venting performance;
• and
• mounting the secondary vent in the tile layer to form an outer roofing layer therewith in air flow communication with the primary vent to provide a venting air flow passage having a fourth venting performance greater than the second venting performance for venting said air.

A ventilated roof, comprising:

• a roof structural layer through which air is to be ventilated;
• a primary vent disposed in the structural layer to provide an air flow passage therethrough having a first venting performance;
• a secondary vent disposed in the tile layer and having an air passage therethrough with a third venting performance smaller than the first venting performance, the tile layer and secondary vent being in air flow communication with the primary vent to provide a venting air flow passage having a combined fourth venting performance approximately equal to the first venting performance for venting the air;
• and
• a plurality of tiles mounted on the structural layer to form a tile layer thereover and arranged to provide air flow passages between adjacent tiles in air flow communication with the primary vent to vent the air and having a combined venting performance.

A method for ventilating a roof, comprising the steps of:

• providing a roof structural layer through which air is to be ventilated;
• selecting a primary vent having a first venting performance;
• mounting the primary vent in the structural layer to provide an air flow passage therethrough;
• selecting a plurality of tiles;
• arranging the tiles on the structural layer to provide air flow passages between adjacent tiles in air flow communication with the primary vent;
• and
• mounting the tiles on the structural layer to form a tile layer thereover having a combined second venting performance.

A ventilated roof, comprising:

• a first roofing layer having a primary vent through which air from an attic is to be ventilated;
• and
• a second roofing layer constructed from a plurality of similar roofing tile elements disposed over the first roofing layer and having an effective third vent in air flow communication with the primary vent to vent said attic, said effective third vent combining air flow passages between the tile elements;
• and
• a secondary vent disposed in the second roofing layer and including an airflow passage therethrough so that the effective third vent combines the air flow passages between the tile elements with the air flow passage through the secondary vent.

A method for ventilating a roof, comprising the steps of:

• selecting a first roofing layer having a primary vent through which air from an attic is to be ventilated;
• selecting a plurality of similar roofing tile elements;
• and
• disposing the tile elements over the first roofing layer to form a second roofing layer having an effective third vent in air flow communication with the primary vent to vent said attic, said effective third vent combining air flow passages between the tile elements;
• selecting a secondary vent with an airflow passage therethrough;
• and
• disposing the secondary vent in the second roofing layer so that the effective third vent combines the air flow passages between the tile elements with the air flow passage through the secondary vent.