Slate Roofing Info






Slate Roofing Photo Gallery

Kraftwerks provides full service slate repair, slate maintenance and slate roofing in DC, Maryland and Virginia.

slate restoration Cumberland, MD

All too often slate roofs are mistakenly replaced when, in fact, they could have been effectively repaired. Deciding whether a slate roof should be repaired or replaced can be difficult and each slate roof must be judged separately. During our site visit we will evaluate your current slate roof, provide photographs and the necessary information for you to fully understand the condition of your slate roof and our proposed slate repair or slate replacement work scope.  Our work is guaranteed.  Not just what we apply but your entire roof.  It is our opinion that if we provide slate repair or slate maintenance for you and we are the professionals then there should be no problems.  In the event that you do have a leak, just call and we will return at no cost during our warranty period.  We can provide three pages of references to substantiate our claim.

slate valley replacement
slate valley replacement           slate valley replacement

Our scope can be anywhere from simple slate repair to full valley and flashing replacement as shown above on a project in NW Washington, DC.


slate restoration MD

We can also restore the guttering and downspouts to their original look.  No prefabricated components.

Please visit our Photo Gallery for more examples of our slate repair work or our Contact Us page to request an estimate for slate repair or slate roofing.  If you need info on copper roofing or tin roofing, just click.
Here is how we perform a slate repair.

Broken, cracked, and missing slates are repaired in order to prevent water damage to interior finishes, accelerated deterioration of the slate roof and roof sheathing, and possible structural problems.

This is our process for proper slate repair of your roof.  The damaged slate is first removed by cutting or pulling out its nails with a slate ripper.  A new slate, or salvaged slate, which will match the size, shape, texture, and weathered color of the old slate as close as possible, is then slid into place and held in position by one nail inserted through the vertical joint between the slates in the course above and approximately one inch below the tail of the slate two courses above.

To prevent water penetration through the newly created nail hole, a piece of copper with a friction fit, called a copper bib, is slid lengthwise under the joint between the two slates located directly above the new slate and over the nail.  The application of roofing mastic, sealants or metal straps that are bent over the tail end of the damaged slates should not be considered a viable slate repair alternative because these materials, though effective at first, will eventually harden, crack or fail, allowing water to enter.

Slate repair is the best option for localized problems and damaged slate roofs with reasonably long serviceable lives remaining. If 40% or more of the slates on a roof or roof slope are broken, cracked, missing, or sliding out of position, it is usually less expensive to replace the roof than to execute individual slate repairs but we still can salvage some of the slates and save on the cost of materials.  When salvaging slates, each must be sounded (tapped with a hammer) to discover cracks, faults and the degree to which it has weathered. It is usually wise to salvage slates when only a portion of the roof is to be replaced. The salvaged slates may be used for future slate repairs to the remaining sections of the roof.  Historic slate roofs should be repaired rather than replaced whenever possible.  Before replacing a slate roof, we check for isolated damage, corroded and worn flashings, leaky gutters, poor ventilation in the attic, and other possible sources of moisture.

Honor, integrity and continually seeking to expand our knowledge are the values Kraftwerks Sheet Metal & Slate LLC aspires to each day and with each project.  We believe these values provide you, our customer, the highest quality, affordable and comprehensive job possible.  Thank you for your interest in our firm.  Please contact us with any questions, request for more information or an estimate request.

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