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| >>History of wood shingles in America | >>Maintenance |
| >>Historic detailing and replacing roofs | >>Taking it further |
| >>Specifications for the replacement roof |
By Sharon C. Park, AIA
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The purpose of regular or routine maintenance is to extend the life of the roof.
- The roof must be kept clean and inspected for damage both to the shingles and to the flashing, sheathing, and gutters.
- If the roof is to be walked on, rubber soled shoes should be worn.
- If there is a simple ridge, a ladder can be hooked over the roof ridge to support and distribute the weight of the inspector.
Keeping the roof free of debris is important. This may involve only sweeping off pine needles, leaves and branches as needed. It may involve trimming overhanging branches. Other aspects of maintenance, such as removal of moss and lichen buildup, are more difficult. While they may impart a certain charm to roofs, these moisture-trapping organisms will rot the shingles and shorten the life of the roof. Buildups may need scraping and the residue removed with diluted bleaching solutions (chlorine), although caution should be used for surrounding materials and plants. Some roofers recommend power washing the roofs periodically to remove the dead wood cells and accumulated debris. While this makes the roof look relatively new, it can put a lot of water under shingles, and the high pressure may crack or otherwise damage them. The added water may also leach out applied coatings.
If the roof has been treated with a fungicide, stain, or revitalizing oil, it will need to be re-coated every few years (usually every 4-5). The manufacturer should be consulted as to the effective life of the coating. With the expense associated with installation of wood shingles, it is best to extend the life of the roof as long as possible. One practical method is to order enough shingles in the beginning to use for periodic repairs.
Periodic maintenance inspections of the roof may reveal loose or damaged shingles that can be selectively replaced before serious moisture damage occurs. Keeping the wooden shingles in good condition and repairing the roof, flashing and guttering, as needed, can add years of life to the roof.
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-- NPS Preservation Brief 19
