Fireplace and Chimney (Leaving Cert Construction Studies): Flashcards

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How chimneys create ventilation

Low pressure at top draws air upwards from fireplace

Cause of fireplace downdraughts

Inadequate low pressure at top of chimney

Wind effect on roofs below 30∘30^\circ pitch

Creates suction zones on leeward side

Min. height above roof contact point

1 metre above highest contact point

Min. total height above fireplace

4.5 metres

Ridge clearance: pitch <10∘<10^\circ

600mm min. above ridge line

Ridge clearance: pitch >10∘>10^\circ

600mm or greater above ridge

Why chimney width increases with height

To improve stability against wind forces

Primary weather protection at chimney top

Precast concrete chimney cap

DPC layer location in chimney

Beneath the concrete cap

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Fireplace and Chimney

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Fireplace and Chimney

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Fireplace and Chimney

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Fireplace and Chimney

Fireplace and Chimney

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