The trouble with inspecting slate roofs is the age of the roof. It may mean the person who installed it and their work practices are unknown to us. Try to imagine the underlayment materials available 100 years ago. Copper, tarred canvas? I most often see no underlayment. When a dry snow is falling the wind can blow it right up under the slate and it falls between the wood planking used as sheathing. A well insulated attic or a house where the heat is kept very low can have snowdrifts a foot deep. A house built 100 years ago has no soffit or ridge venting. Gable may or may not be present. When the snow melts in the spring the attic will show water stains/damage. I’ve also seen slate roofs repaired with adhesive snow and ice shield at the eaves and recovered with slate. In the summer heat the membrane softens and drips thru the gaps in the plank sheathing. It gets cooked by the dark tile above and the material is lost when it drains away.
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The following is an image of what appears to be a standard slate roof. A small gable runs into a larger combination creating the valley seen prominently. Copper flashing is used continuously in the valley and the slate has been properly installed overlapping. Copper is also used on the eaves, and copper fasteners should be used to prevent galvanic corrosion.
When inspecting slate roofs, pay close attention to repaired sections of the roof. Repaired sections are important because often times, the roof was leaking there prior to the repair. When slate roofs are repaired, often underlayment is damaged and not repaired. Checking the areas below repaired roofs for signs such as staining will give an indication of the current health of that section by checking moisture levels.
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I chise a picture of a slate roof valley. This slate roofs valley is an open valley. The copper flashing is great material which cpupd last arpund 70 years. It looks like the only used one layer of slate tile at the eaves but may hace a cant strip to prevent future problems.
I chose the picture of the slate nailing detail. When nailing slate shingles the nail should be made of copper, stainless steel or hit dipped galvanized. The nail should be just above the shingle to prevent priblems. 2 nails should be used per shingle unless the shingle length is greater than 20" then you should use 4.
The picture exposes weathered flakes, top layer is exposing the tile to further UV and possible moisture absorption. The roof also developed moss, with indicate moisture levels in tile. There were also maintenance done to the roof, as some tiles shows color variation, missing tiles, clips and exposed fasteners.
Deck Bracing, parallel to beam, indicated that upright posts be cemented and equal in height for attachments to the beams. The 3 posts is braced by 4 braces (2 inner & 2 outer) at 2’. Braces are fastened to the beams with 3/8 inch thru bolts. The braces prevents the deck from collapsing/imploding.
Finished internal stairs are possibly the toughest challenge a wood member of staff will face and so are often the particular exclusive domain with the “stair specialist”. That is particularly true with all the more difficult systems for instance circular stairways. However, in terms of straight works, adjustable segment systems tremendously simplify the method
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I enjoyed this course if i was to get into the roofing business this would be it slate seems to be a art form to installing and it seems that this is where the money is when it comes to roofing installing slate is like being a famous painter . there is an art to it and that craftmanship is of the best quality work that you can do .
this is a money making art form that also take patience to and the know how and want to do the best job possible and dedication of the craft workmanship . like i said earlier if i was in to roofs this would be it…
Slate roofs can be very difficult to inspect as key components may be hidden or inaccessible. By inspecting the visible parts of a slate roof you can check the overall quality of the installation and skill used, this can give you a general idea of how the hidden parts were installed as well.
Moisture absorption can be a major reason that a slate roof could deteriorate. The density of the slate has a strong effect on its durability. The higher the density will make the slate less porous and less likely to absorb moisture.
Great article, Thanks for sharing…
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Some key things to look for when inspecting a slate roof are proper flashing at roof penetrations. The slate shingles at Hips, valleys and ridges should fit together tightly. The slates should have a 3 inch headlap and step flashing should be used at any sidewalls.
I read the article about condensation in double panes windows. Double panes windows have a layer of gas trapped between the panes created a seal for insulating purposes. When the Windows lose this seal condensation gets in and shows in one of two ways riverbending and or silica desiccant .
The image I chose is of a slate roof tile that has gone through a spalling process. This occurs because of a number of things including: freezing, thawing, thermal expansion and contraction, and salt deposition. All of which can be difficult to avoid depending on where you live in the country.
I chose the article “home inspection tools and equipment list”. I picked one to explain its function. GFCI testers are very important to a home inspection because you have to test every receptacle in the entire home and for every GFCI outlet you come across, you must test its safety function by tripping it.
One of the slate tiles is missing. One of the slated tiles is cracked.One of the slate tiles is loose. These are typical signs of aging slate roofs. I recommend having a qualified slate roofing contractor evaluate these issues and repair as necessary. I recommend an annual inspection of the roof covering and repair as necessary.
