As I said before, this new construction will be covered in a house wrap, such as Tyvek. Oftentimes, if you're installing in a re-roofing situation, you're going to be coming up against vinyl siding, brick, wood. In those instances, the best thing to do is remove the siding and run the flashing up against the wall, and replace the.

1. How To Install Roof Flashing Against Brick
2. Install Roof Flashing Against Brick Wall
3. How To Install Roof Flashing Against A Wall

Roof to Wall Intersections There have always been problems with the flashing details at the roof to wall intersections of Head Walls, Rake Walls, and Chimneys - especially if Brick or Stone Veneer or Stucco is used. Ever wonder why Exterior Wall Coverings wear out so fast at the roof line many times causing the property owner to replace the exterior wall covering prematurely? It is because the intersection between the roof and the exterior wall covering is not properly installed and flashed. This oversight has been going on for years and costing property owners many thousands of dollars. For several years now, a moisture barrier has been installed over all the walls, commonly called a House Wrap, before any type of Exterior Wall Covering is installed. This house wrap should be installed over the top of a 'through the wall flashing' to shed the moisture that gets behind all Exterior Wall Covering materials back out onto the roof surface. Here are the problems.

Often with new construction the roof flashing is first nailed to the wall. Then the house wrap and exterior wall covering are installed over this roof flashing. There sometimes is a problem with movement differences of the wall and the roof decking when the flashing is fastened to both the wall and the roof.

Many times the roof flashing needs to be adjusted to the coursing of the roof covering and sometimes replaced because it was damaged or for some other reason. This cannot be properly accomplished without removing the exterior wall covering. Often the Exterior Wall Covering is placed directly onto the surface of the roof when it must be a minimum 1 1/2' off the roof's surface. Some manufacturers of Exterior Wall Coverings require a minimum of 2' above the roof's surface. (See ) This helps prevent the Exterior Wall Covering from prematurely deteriorating from soaking up moisture, freeze/thaw effect, etc.

Other times the house wrap and the Exterior Wall Covering do not properly overlap the top of the roof flashing a minimum of 2'. When replacing the roof covering in the future there is another problem roofers are faced with. How can the roofing contractor properly replace the roof insuring that the new underlayment and roof flashing are turned up the wall the proper distance and are properly overlapped by both the house wrap and the Exterior Wall Covering. Both the Building Code and good roofing practices require this. By the way, roofs get replaced frequently here in Colorado, my guess is every 10 to 15 years for many. The stucco wall pictured above is brand new.

The homeowners had this done just before they were to have a new roof installed. Good idea, but they did not rectify the flashing situation when they had a chance to do so. This is the major problem that frequently occurs when replacing a roof that has Stucco, Brick, or Stone veneer. The old roof on this structure was shakes. The existing step flashing shown here is rusted, has holes in it, and is placed on a 10' weather exposure for shakes. It cannot be pulled out from behind the stucco because the weep screen at the bottom of the stucco is attached to the wall with nails. The new roof is going to be laminated asphalt shingles.

The new step flashing must extend up the wall a minimum of 4' and must be laced with each course of the new asphalt shingles. The shingle's weather exposure is 5'. The new step cannot be inserted up behind the stucco and house wrap because the weep screen at the bottom of the stucco is attached to the wall with nails.

For the same reason the new underlayment cannot be turned up the wall as required. The roof flashing cannot be installed on the outside of the stucco and counter flashed.

How To Install Roof Flashing Against Brick

The water that does penetrate behind the stucco will then be trapped there or worse, forced down the inside of the walls and ceilings possibly causing damage and mold. Below are more photos of Poor Flashing at Roof to Wall Intersections with different Exterior Wall Covering materials. Here Stone Veneer is installed below the surface of the tile roof where freeze thaw cycles are tearing the mortar apart. Yes, even flat roof to wall intersections are not being properly done. The flat roofing material must go up the wall a minimum of 12' or up the wall and over the top of the wall if the wall is less than 12' high. Here is an attempt, though maybe not a very good one, to make the roof flashing serve also as a 'through the wall flashing' with a tile roof.

Lets not leave out the Exterior Wall Covering made of wood lap siding. Did you know one of the main reasons wood siding has to be replaced before its time is because it rots at the intersections with the roof. A few more years here and the exterior wall covering will need to be replaced. The Solution The only way to properly drain the the water that gets in behind the Exterior Wall Covering back out onto the roof's surface is to cut out the existing exterior wall covering being careful not to cut the house wrap.

The best solution to do this is to install a 'Through the Wall Flashing' called a 'Z' Bar Flashing. This Through the Wall (Z Bar) Flashing is placed over a piece of Vertical Blocking/Backing Material that is the same thickness or just slightly less than the thickness of whatever type of Exterior Wall Covering that is used for the wall covering and a minimum 5 1/2' in height. Because most roof flashing is required to extend up the wall a minimum of 4' and some a minimum of 5'.

Most simply use a nominal 6' piece of lumber. The Roof Flashing is then placed up behind this Through the Wall (Z Bar) Flashing on the outside of the Vertical Blocking/Backing Material. The Exterior Wall Covering material is then kept off the surface of the roof. This way, each time in the future when the roofing material is replaced, the Stucco, Brick, or Stone Veneer will not need to be cut out and replaced. Below is a sketch of what the flashing at roof to wall intersections should look like. Yes, there will be a little more exposed metal along the rake walls, head walls, and chimneys but this Through the Wall (Z Bar) Flashing will look very nice if pre-painted. Besides, anyone can tell from 2 blocks away that you have a Veneer on your walls if you do not see metal.

All real Brick or Stone through the roof walls and chimneys and those that set on lintels always have metal exposed at all intersections with the roof. For more information on how to properly flash roof to wall intersections see the web pages and.

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. Roof-wall flashing detail specifications & SNAFUs: This article illustrates and discusses alternate or rather goofy attempts at roof-wall intersection flashing to prevent leaks & water damage and points out where leak risks may remain.

In our page top photo my grandson, Tanner Gilligan points out the white caulk that was installed as a stopgap measure where the builder has installed a bay window into a stuccoed wall without proper roof-wall flashing (red arrow). Tanner would have also pointed out the horizontal flashing (orange arrow) had he not needed his other arm to hold on to the building.

Wall Flashing & Step Flashing Snarl-Ups to Avoid This article series discusses best practices construction details for building exteriors, including water and air barriers, building flashing products & installation, wood siding material choices & installation, vinyl siding, stucco exteriors, building trim, exterior caulks and sealants, exterior building adhesives, and choices and application of exterior finishes on buildings: paints, stains. Above we show a feeble attempt at flashing and counter flashing at the roof-wall intersection of a low slope roof. The installer tacked a row of asphalt shingles to the wall, caulked their top edge, and hoped for the best.

Proper Roof-Wall Flashing Example To install the roof-wall flashing above the builder bent the top edge of the flashing into a 90-degree lip about 2 cm in width. That lip is then set into a reglet or groove, in this case cut into the mortar joint of the brick wall above. Above the flashing lip the groove is sealed with mortar or with a sealant to prevent water from running behind the flashing and to hold it in place. Just below we illustrate a proper installation of flashing, in this case lead, installed at the abutment of a lower roof to a masonry wall on a building near Goodrich Castle in Ross on Wye in Herefordshire in the U.K. Also see More Questonable or Ugly Roof-Wall Flashing Examples Below we illustrate that using a single piece of metal flashing where the uppermost edge of a shed-roof abuts a vertical building sidewall works fine, though the use of exposed nails (see our photo below) may form leak or wear points in the roof.

Install Roof Flashing Against Brick Wall

Below we discuss the very different case of the use of single-piece versus step flashing at the abutment of the side of a sloping roof to a building sidewall. Re-Using Step Flashing When Re-Roofing? At re-roofing time, when the old shingles are to be torn off, it's not always so easy to re-use the original step flashing that extends up under the building siding.

The new shingle courses have to line up exactly with the original shingle course/step flashing placement, the old step flashing is often bent-up during old shingle removal, making it hard to get the new shingles to lay flat. As we see in our step flashing re-use at re-roofing time photo (left) the installer cut the new shingles too long so they have two reasons to be buckled, lifted, and vulnerable to wind-blown rain leaks at this building wall. More Step Flashing Snarl ups It's easy to get confused when installing step flashing, leading to lots of building leaks. Our step flashing snafu photos below demonstrate a few typical step flashing snarl ups.

At left our photo shows some interesting work. It looks as if someone re-sided the building and installed new counter flashing over a wood strip along the roof-wall intersection. At least we hope the brown bent-over flashing also extends up under those clapboards.

But take a closer look (click to enlarge) and you'll see that the new roof shingles are out of step with the original step flashing, so that the flashing extends less than an inch on top of each shingle course, and the head of the flashing in some locations appears not very far at all under the shingle course above. This installation looks questionable. Check inside for leaks.

Flashing against irregular sidewalls such as this up-state New York cabin (above left) can require some thought. We'd need to use custom-formed lead counterflashing as is done on tile roofs, or cut a reglet into the wall deep enough to bend the counterflashing and hook it into the wall to keep wind-blown rain and wall run-down rain from moving behind this step flashing.

Our second photo (above right) shows leak stains on the interior of the building wall where this detail was used. Proper Roof-Wall Abutment Flashing Examples Below are two photographs of roof-wall step flashing, completed and effective of a slate roof against a brick wall (below left), and in-process, with step flashing against a dormer sidewall before the dormer siding has been put in place (below right). Also see for more details about proper exterior wall flashing specifications.

Use of Continuous Single-piece Solid Metal Flashing vs. Step Flashing at Roof-Wall Abutments - Steep Slope Roofs? Our photo shows the bottom end of a single-piece of (damaged) sloped-roof-wall flashing. In our OPINION it's not likely that this flashing installation will long resist any significant quantity of water at the lower roof edge, and both blowing wind and any backup due to gutters, ice, or snow will exacerbate the leak risk.

Points out that while continuous metal flashing is used at wall junctures in certain steep-slope roof installations, special flashing installation details are required that are different from a step-flashing sealed roof, and even when installed according to specifications, this approach can leave the roof vulnerable to leaks or moisture damage from wind-driven rain. If single piece flashing is to be used, according to Mr. Berg, paraphrasing. The flashing needs to be installed before installing the roof shingles. The metal flashing is formed with a hook edge and cleated on 12' centers. The flashing extends up the wall at least 4'. The flashing extends onto the roof a minimum of 2 inches - 4 inches is preferable in more severe climate areas.Publisher & Editor.

's Building Advisor at helps homeowners & contractors plan & complete successful building & remodeling projects: buying land, site work, building design, cost estimating, materials & components, & project management through complete construction. Email: Steven Bliss served as editorial director and co-publisher of for 16 years and previously as building technology editor for Progressive Builder and Solar Age magazines.

He worked in the building trades as a carpenter and design/build contractor for more than ten years and holds a masters degree from the Harvard Graduate School of Education. Excerpts from his recent book, Wiley (November 18, 2005) ISBN-10:, ISBN-13: 9369, appear throughout this website, with permission and courtesy of Wiley & Sons. Best Practices Guide is available from the publisher, and also at. lists recommended books, organized by topic & available for purchase. Most of our articles also include as well as other references, and information sources. Critique, contributions wanted: to suggest corrections or additions to articles at this website, and if you wish, to receive online listing and credit as a contributor. Particular thanks are due to the many experts and also consumers who read and critique technical articles.

Additional technical contributors & reference sources for this article are listed below. John Wiley & Sons, 2006. ISBN-10:, ISBN-13: 9369, Hardcover: 320 pages, available from and also. See our of this publication. technical consultant on networking, LAN design, applications support., 914-204-1749, email:., Advantage Home Inspections, Flemington N.J. 08822 home inspector, 908-806- 6364, Home, Radon & Termite Inspections, Central & Parts of North New Jersey, email:. 'Flashing: the plain solution to leaky walls', Thomas E.

Remmele, Manager, Technical Services, Sto Corporation, Building Standards, November/December 1999 p. National Roofing Contractors Association - 10255 W. Higgins Road, Suite 600, Rosemont, IL, Tel: (847) 299-9070 Fax: (847) 299-1183. ', Donald Berg, P.E., Professional Roofing (NRCA), June 1993, p. Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the.

Also see our., Steve Bliss (Editor), The Journal of Light Construction, Williston VT, 2010 ISBN 10: 1-928580-42-4, ISBN 13: 978-1-928580-42-3, available from. has generously given reprint permission to InspectAPedia.com for this article. All rights and contents are ©Journal of Light Construction and may not be reproduced in any form. 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email:. The firm provides professional & &.

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How To Install Roof Flashing Against A Wall

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