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ROOFING INSPECTION & REPAIR
AMERICAN CEMWOOD ROOFING
BEST ROOFING PRACTICES
BUILT UP ROOFS
CATHEDRAL CEILING VENTILATION
CERTIFICATIONS for ROOFING CONTRACTORS
CHIMNEY FLASHING Mistakes & Leaks
COLD WEATHER ROOF TROUBLE
DECKS, ROOFTOP CONSTRUCTION
EPDM, RUBBER, PVC ROOFING
EXTRACTIVE BLEEDING on SHINGLES
FIRE RETARDANT PLYWOOD
FLASHING on BUILDINGS
FLAT ROOF MOISTURE & CONDENSATION
Green House or Solarium Roof Leaks
HEAT TAPES & CABLES for ROOF ICE DAMS
ROOF ICE DAM LEAKS
MASONITE WOODRUF FIBERBOARD ROOFING
NOISE CONTROL for ROOFS
PLASTIC ROOFING TYPES
PVC, EPDM, RUBBER ROOFING
ROOF ARCHITECTURAL STYLES - PHOTO GUIDE
ROOF CLEANING RECOMMENDATIONS
ROOF COLOR RECOMMENDATIONS
ROOF INSPECTION SAFETY & LIMITS
ROOF LEAK DIAGNOSIS & REPAIR
ROOF NOISE TRANSMISSION
ROOF REPLACEMENT SNAFUs
ROOFING FELT UNDERLAYMENT REQUIREMENTS
ROOFING MATERIALS, Age, Types
SADDLE CONSTRUCTION at CHIMNEYS
SNOW GUARDS & SNOW BRAKES
STANDARDS for ROOFING
STRESS SKIN INSULATED PANELS
TEST LABS - ROOF SHINGLE
TREES & SHRUBS, TRIM OFF BUILDING
TRUSSES, Floor & Roof
UNDERLAYMENT REQUIREMENTS on ROOFS
VENTILATION in BUILDINGS
WALK-ON ROOF SURFACES
WARRANTIES for ROOF SHINGLES
WORKMANSHIP & ROOF DAMAGE
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, worn out slate roofs, types of slate roof wear and damage, and stains or discoloration 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 tips. This article series assists home inspectors, building buyers or building owners, and roofing contractors in evaluating the condition of slate roofs by providing photos of various slate materials, patterns, defects, and conditions.
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Slate damage at chimney and lower edge, probable leaks at chimney. Why to the slates seem loose particularly around the chimney?
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.
Thickness of Roofing Slates, Close up Photo of Slate Edges in Good Condition
White Stains on Slate Roofs
We are buying a house with a slate roof on a six year old home...the roof has long white stains down from the chimney. Looks like it's 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 chimney? Steve I'm 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 - discussed at White/Light Stains on Chimneys.
See STAINS on ROOF SHINGLES for our library of types of stains found on roofing surfaces. There we include this comment
White stains on slates themselves (photo at left) as a wear indicator are discussed in the article above on this page.
To diagnose white stains that are on a roof, building chimney, or walls, and specifically around or below a chimney, I'd be alert for flashing leaks - check indoors - and I'd follow the white stains up to their point of origin on the roof to see just what materials are there, for example:
Finally, I can comment more accurately if I can see some photos of the roof in question. Here are articles on building roof stains:
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Frequently Asked Questions (FAQs) about slate roof inspection, leak troubleshooting, repair or replacement