A Photographic Guide to Slate Roof Defects. SLATE ROOF DEFECTS CONTENTS Photo Guide to Slate Roof Defects key on roof or at roof edge slate roof inspection points. Tina Design Suite Patch Key Crack' title='Tina Design Suite Patch Key Crack' />Photo library of slate roofing materials slate conditions Slate wear indicators that you can evaluate by visual inspection Examples of new, normal wear, and worn out slate roofs. POST a QUESTION or READ FAQs about slate roofs slate installation, flashing, slate sources, slate roof leaks, stains, diagnosis, repair advice. REFERENCESInspect. APedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. Slate roof defect photo library this slate roofing photo series shows all kinds of roofing slate defects. Here we give photographs of slate roof conditions including normal wear on slate roofs. Starting at SLATE ROOF INSPECTION REPAIR we describe procedures for evaluating the condition of slate roofing. We describe the. types of roofing slate, common defects, inspection topics, and some repair. Tina Design Suite Patch Key Crack' title='Tina Design Suite Patch Key Crack' />This article series assists home inspectors, building buyers or building owners, and roofing contractors in. Green links show where you are. Copyright 2. 01. 7 Inspect. Apedia. com, All Rights Reserved. A Photographic Guide to Defects in Slate Roofs. Photo guide to Cracked, Broken Slate Roofing Inspection Repair. Article Contents Cracked, broken slates, probably not leaking but note the diagonal crack in the slate below the course with a missing slate half. Download the free trial version below to get started. Doubleclick the downloaded file to install the software. Cracks Slate crack repair, copper was slipped up over a slate which had split just below the butt joint of slates in the next course. Photo Guide to Delaminating Roofing Slates. Delaminating roofing slate, if the delamination is only in the upper surface layer of the slate the material may have substantial remaining life. Also ask how many of the roof slates are delaminating at all note the neighboring slates on this roof are sound. InformationWeek. com News, analysis and research for business technology professionals, plus peertopeer knowledge sharing. Engage with our community. Tina Design Suite Patch Key Crack' title='Tina Design Suite Patch Key Crack' />Surface delamination on slates Notice the surface delamination on some of these slates. A close inspection is needed to evaluate slate delamination when it looks like this. Bf-480 Programming Software English. We need to know if the slate is basically sound, hard, and secured to roof, or if alternatively the delaminations are throughout the slate body, making it soft. See our photos at SOFT DETERIORATED SLATES where we show close up photos of slate that looked pretty good on the roof but when touched, disintegrated easily. Photo Guide to Slate Roof Flashing Details. Flashing Chimney in the roof valley, was a probable factor in recurrent leaks in this slate roof. Flashing Slate roof with good side wall step flashing, against a brick wall. Flashing Suspect copper valley in slate roof, note the attempt to patch the valley with roof mastic and the cracks in the mastic this repair is not durable. Photo Guide to Loose, Sliding, Lost Roofing Slates Slate Nails Nails sliding slates, mean the nails are lost perhaps from corrosion. Dont underestimate the implication of many slates which have moved only a little bit all may have lost their nails. Notice also the surface delamination on some of these slates. Nails Slate fastener failure, might be indicated by the slate at right if it is sliding down can you move it back up If you can, this slate has lost its nail and is not connected. Use a slate hook or copper tab to secure the loose slate in place. Nails Roof Tiles not slate, repaired using copper strips the strip ends holding tiles have been bent back by sliding snow expect movement, leaks, and extensive nail failures. This defect also occurs on slate roofs repaired using this method. This demonstrates the advantages of slate hooks in lieu of copper strips when replacing lost slates. Slate damage at chimney and lower edge, probable leaks at chimney. Why to the slates seem loose particularly around the chimney Often the building framing settles away from the masonry chimney as framing ages, sags, or settles due to shrinkage or later rot or other in building damage. But the chimney, built of masonry, tends to remain the same height. Role Management Tool To Install .Net 2.0'>Role Management Tool To Install .Net 2.0. On many old houses the framers actually connected roof framing right to the chimney. Later when the building sagged, settled, or moved, the framing pulls away from the chimney causing damage to the roofing slates and flashing, and leading to leaks in this area. Another common source of slate roof damage around a chimney is wear and movement caused by flashing leaks and, in freezing climates, frost. Photo Guide to Slate Roof Defects Mineral Inclusions Staining in Slates. Mineral inclusions Slates with mineral inclusions, the wash out of minerals in some slates can lead to holes and leaks. Mineral inclusions, holes in slates the slates with these defects need to be replaced or patched from below with copper panels. Stains and Wear Indicators on Slate Roofing, a Photo Guide. Staining on roofing slates Slate edges showing moisture absorption, but generally good condition, these slates have a good remaining life. White Efflorescence on roofing slates the white markings shown on these roofing slates, is a mineral deposit left behind as water evaporates. Water penetrating the slate material absorbs minerals and leaves some of them, probably Ca and Mg on the slate surface. Many slate roofers and slate inspectors assert that as the white stains progress from the edges of individual slates towards their center, one can estimate the remaining roof life. Drivermax Cnet. If 5. 0 of the slate remains inside of the white area, the slate may have about half of its life remaining. We recommend that this condition be confirmed by close inspection as well since other slate deterioration factors could be at work. Thickness of Roofing Slates, Close up Photo of Slate Edges in Good Condition. Slate edge close up, showing the natural layering of mineral deposits in the original stone. Thickness Measuring slate thickness, and close up inspection permits check for slate delaminating and softness. Thin, worn slates, French and conventional pattern, missing slates, tar patches, leaks. This roof is probably repairable But we d need a closer look at those slates to evaluate their thickness and hardness. White Stains on Slate Roofs. Reader Question long white roof stains down from chimney. We are buying a house with a slate roof on a six year old home. Looks like its coming from the flashing around the stone chimney. Thoughts Steve. Reply possible sources of white stains on roofs and buildings. White stains down FROM the chimneySteve Im not sure and would need to see some photos use the CONTACT link found at top, side, bottom of our pages to send me some pix. Our photo at left shows white efflorescence on the outside of a masonry chimney discussedat WhiteLight Stains on Chimneys. Search Inspect. APedia for. Chimney Stains, Discoloration, Leak, Diagnosis, Cleaning Repair Guideto see white efflorescence stains on chimneys themselves as well as other types of stains on chimneys themselves photo at left. White stains on a roof can be pigment wash down from something above, salts from flashing corrosion, and on slate, white stains that form on individual slates, beginning usually as a roundish spot at the center of individual slates, are a sign of aging and wear. See STAINS on ROOF SHINGLES for our library of types of stains found on roofing surfaces. There we include this comment.