
Home Clinic; METHODS OF KEEPING THE FIREPLACE FROM SMOKING (Published 1981)
Homeowners often find themselves reluctant to use wood-burning fireplaces due to their perceived inefficiency, particularly when the central heating system is active. However, many still appreciate the comfort a fireplace provides on a chilly day. A common issue encountered with fireplaces is smoking, which typically stems from one of four primary causes: a clogged chimney or damper opening, the fire being positioned too far forward in the fireplace, an excessively large fireplace opening relative to the flue size, or downdrafts caused by overhanging tree branches or nearby tall structures.
Addressing a suspected obstruction in the chimney, such as a bird's nest or a malfunctioning damper, can often be done by visually inspecting the flue with a mirror from inside the fireplace. If direct observation is not possible due to structural design, a simple test involves lighting a page of newspaper and holding it near the flue opening under the damper. Rapid smoke ascent and evidence of good draft indicate a clear chimney. Conversely, poor draft suggests a partial blockage, necessitating the services of a chimney sweep.
For optimal performance, a fireplace fire should be located close to the back wall, or within a few inches of it. If smoking occurs and the fire is not in this position, adjusting the andirons or fire basket to move the fire further back can resolve the issue. An oversized fireplace opening can lead to smoke seeping into the room due to a loss of draft, especially on windy days. To diagnose this, one can temporarily reduce the opening size using a nonflammable material like a sheet of metal. By gradually lowering the metal shield across the top of the opening while a fire burns, the exact reduction needed to stop smoking can be determined. Permanent solutions include installing decorative metal plates or hoods, or physically reducing the opening height by adding fire bricks to the fireplace floor.
Problems caused by overhanging branches or nearby tall structures present a trickier challenge. Ideally, there should be no structure or branch taller than the chimney top within a 10-foot radius. Overhanging branches can be pruned. However, if a new structural addition to the house, such as a dormer, is the cause of downdrafts, increasing the chimney's height might be the only effective solution.
The article also addresses a reader's question regarding cold floors in upstairs bedrooms located over an open porch. The reader inquired about alternatives to blowing insulation into the space between the porch ceiling and the floors above, specifically asking if placing material under the carpet could significantly reduce cold transfer. The response indicates that while any additional layer might offer minimal help, even the thickest carpet padding provides comparatively little insulating value. The most effective solution remains blown-in insulation. Another viable alternative is to install insulation board on the porch ceiling and then cover it with a new ceiling. This comprehensive guide offers practical advice for common fireplace issues and a related home insulation query, aiming to improve home comfort and functionality.
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