How to Install a Standing Seam Metal Roof – DIY Guide

standing-seam-metal-roof-installation This instructional guide is based on Fabral’s nailing-strip standing seam system, with 1″ ribs. Before you actually go ahead and order any panels for the job, we recommend that you thoroughly read this guide, and watch the video below to get a better idea of just how involved this can be.

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Installation Video:

Before you take on the installation, be sure to watch the video above a few times so that you have a very clear picture of what is involved in the installation process, and see whether you really want to tackle such a big project on your own.

General considerations:

When installing a standing seam, it is strongly recommended that all asphalt shingles are removed before the installation in order to prevent / avoid the “telegraphing effect” where horizontally installed shingles punch through the vertical sheet metal roofing panels, causing unsightly dents that cannot be fixed / removed. Also, since most standing seam roofs installed are made out of steel, the granular surface of asphalt shingles will rub against underside of metal roofing panels, and thus will likely scratch through the paint and galvanized layer, which will cause metal panels to rust from underneath.

Measuring basics:

When ordering materials, it is important to correctly measure the length of your panels, so that you don’t end up with panels that are too short and unusable.

Measure the vertical run from the eave of the roof, all the way up to the ridge line, and order your panels at least 2 inches longer than the length of your gable / roof run. These two extra inches will be used to form a drip-edge hem. Note that a typical standing seam drip edge extends 1 inch beyond the eave, and that you will need to make a reverse hem in order to lock the panel into the eave starter. – That’s where the two extra inches come into play.

Steel or aluminum?

In my opinion, aluminum is a much better choice of material compared to steel, when it comes to standing seam metal roofs. Aluminum will not rust, and is the safest option to install in coastal areas. While most architectural steel standing seam roofs are made with high quality galvanized metal (usually Galvalume or G-90 steel), there is still that chance that you may place a few deep scratches onto the panels and it will eventually rust. While aluminum is more expensive than steel, I think the price difference is well worth it, especially if you happen to live near the coastline or marine environment.

A note to Homeowners and First-time Installers:

For do-it-yourself enthusiasts, for your first installation we recommend installing standing seam on a simple gable roof, with minimum roof penetrations. If you have chimneys, skylights, dormers and/or valleys on your roof, we recommend you leave this task to a seasoned professional installer, because it’s really easy to make costly mistakes when installing metal flashing and other details. – An improperly installed metal flashing could cause premature roof leaks and require expensive repairs down the road.

Installation Process:

standing-seam-metal-roof-installation

Eave trim / starter strip installation:

The very first flashing is the WEF-1 eave trim that should installed prior to the roofing under limit.

The WEF-1 is intended to be used on roof pitches up to six twelve. For roof pitches greater than six twelve, a two piece eave trim of WEF-2 and WEF-3 can be used. Within this video the WEF-1 will be used.

Place the top of the WEF-1 trim in line with the substrate and fasten to the decking eighteen inches on center with roofing nails. The eave trim will be fastened along the fascia with number fourteen screws spaced sixteen inches on center.

The next segment will show how to flash two eave trims that meet at a valley and a hip. Note the use of graphite pencils on painted steel will corrode it over time. Cut the trim as shown or needed, and attach as described previously with appropriate roofing nails and screws.

Take note of the angles cut to allow for the trims to overlap. Sealant should be used between any trims that overlap.

Underlayment:

Now that all the eave trim has been fasted, the underlayment can be attached. Cover the entire roof with thirty-pound felt paper or titanium underlayment. Ice and water shield should be used at all valleys, chimneys and skylights. In cold climates ice and water should to be used at the eaves and extend twenty four inches past the exterior walls.

The installation of the underlayment is started at the eave & a gable end, and rolled out parallel to the eave line.

Allow each consecutive course to overlap the previous by four to six inches.

Overlap the end of minimum of six inches when starting a new roll of underlayment. Areas that have been torn or cut should be replaced or repaired prior to installation of the climate guard panel. At side wall and end wall conditions continue the underlayment a minimum of six inches up the wall and fasten.

To prepare for installation of the first panel apply a bead of beetle sealant on the eave trim.

Details on cutting and hemming a panel:

Make a mark one inch from the end of the panel and cut along the base of each rib with snips. Use the bending tool to form a hem under the pan.

Cut off the under lap rib completely. Remove leg and rib top from overlap rib with tin snips. Then tab around rib and cut flush.

Place an alignment line along the gable end, one half inch from the edge and square with the eave line. This is where the first panel will be started.

Set butyl sealant tape along the eave trim. Place the first panel with overlap leg along the alignment line. In cold weather, slide the panels tight again eave flashing, and in warm weather allow a gap for expansion. Fasten panel side with number ten pancake head screws and the top of the panel with three number fourteen mill points.

The second panel is installed in the same fashion. Place sealant over underlap rib before sliding hem over the eave trim. Snap first two to three inches of panel together, and slide the panel tight against the eave trim, or with the gap depending on the temperature. Snap the panels together and fasten along the opposite side and top of the panel.

The eave hem can be tightened by crimping with duck bill wise-grips or flanging tool after the installation is complete.

Attaching gable trim over the panel:

To finish off the end, cut along the bends and fold top plane down ninety degrees towards eave trim and cut other flaps flush. To view other options on finishing off the gable, review the clima-guard installation manual.

Install a bead of sealant tape along rib a panel, lay gable trim in place. Fasten along fascia board every twenty-four inches on center with number ten wood fastener or number fourteen mill points screws.

Ridge caps:

The installation video above shows a vented ridge cap with RX10 Versavent material that is pre-attached before shipping.

Place the ridge cap over the panel and fasten with number twelve stitch screws through each rib. Overlap the next ridge caps six inches with sealant between the laps.

Optionally, you can install solid or vented Z-bar flashing between the ribs, and fasten them down with roofing screws. Use polyurethane sealant between the z-bar flashing and the metal roofing panel. Also, seal the opening between z-bar flashing and ribs, on each end of the z-bar. Apply sealant to the back side of the closure near the ribs and over the flanges to seal gaps.

Valley flashing:

standing seam metal roof valley flashing installation Focusing on the valley area, the first step is to place ice and water shield center down the valley. Cut the valley flashing to the angle and length needed to secure over the ice and water shield. Apply roofing underlayment on top of the valley flashing.

In the installation video you can see the next flashing to be installed, is the WVC-1 valley cleat. You can optionally use a valley flashing with built-in reverse lock, which eliminate the need for valley cleat.

First, apply a bead of beetle sealant tape to the bottom side of the valley cleat. Position the valley cleat six inches away from the center of the valley. Fasten with number ten pancake head screws at twelve inch spacing. Now that the valley cleat is installed we’re ready to start cutting and hemming panels for the valley.

Before installing the panels place a bead of butyl sealant tape along the eave flashing and on top of the valley cleat as shown. This is a shot of what the panel will look like and how it will be placed on the roof when finished.

Cut the climate guard panel at the appropriate angle in length to allow for a one-inch hem at both the eave and valley cleat. – This is done by cutting along the rib, so the bending tool can be used to complete the hem.

To finish off the overlap rib, cut the metal to allow the inside flap to fold over the opening where it can be cut flush with the edges.

Installing the panel can be done by placing sealant over the underlap rib and aligning the panel before snapping the panels together.

Once aligned, snap the panels together working from the eave up the run of the panel. Secure the top of the panel with number fourteen mill point screws. To finish off a panel at the gable end or side wall, first determine the width of the panel needed.

Many panels will not end as a full sheet and will need to be cut and bent to make a one inch-high flange as shown in this picture.

standing-seam-sidewall-flashing Using the bending tool, bend a one-inch flange down the length of the panel. Partial bends may need to be performed along the length of the panel for longer runs till the desired bend is achieved.

If the panel is used for a gable end, attach sealant along the one inch high flange, and secure with the WGF-4 gable trim as previously described.

For demonstration purposes in the installation video, the panel is used as a side-wall condition with the double WSW-4 flashing. Place a bead of sealant over the one-inch flange and set the flashing in place and fasten with number ten pancake head screws every twelve inches on center.

Installing hip-cap, using the hip cap enclosures:

standing-seam-installation-hip-cap-installation The method shown will use a J-trim and an asphalt impregnated sealer strip to close off the void created between the hip cap and the flat portion of the panel.

First place butyl sealant tape in the pan of the panel where J-trim will go. Cut J-trim to the desire shape and position the trim in the pan of the panel over the sealant. Screw fastened trim to the panel with number ten pancakes screws or number fourteen mill point screws.

Use one part polyurethane sealant up the back side of the closure near the ribs and over the flanges to seal gaps. If using asphalt impregnated sealer strip as shown in the top left panel, lay the strip across the panel and apply beetle sealant on top and bottom. When the top of the panel meets a wall, it is finished off by using a closure strip with beetle around the perimeter and set in place on the panel.

Place a line of sealant across the tops of the J-trim and closure strip before attaching the hip closure.

Place the hip cap down and fasten with number twelve stitch screws at every rib. Note the bottom of the hip cap was bent down to give a finished appearance.

Returning back to our end wall condition, place the WEW-2 flashing over the closure and screw through the main ribs with number twelve stitch screws.

Closing Thoughts

This was a quick overview of the most common standing seam metal roof installation techniques and details.

If you will be installing a standing seam metal roof yourself, it is best to buy materials from a local sheet metal roofing supplier, as many suppliers have the capability to make your standing seam panels right on a job-site. – This way you can avoid paying high shipping costs, and often not pay any sales tax.

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4 comments

  1. Generally speaking, it’s much easier to install corrugated metal sheets than standing seam as there is no hemming involved. I agree with the author that it’s a good idea to practice on a small garage or a shed, first, as most people will have no idea where to begin with a standing seam installation.

    Overall, I found this to be a helpful overview of all the main steps involved, with fairly-specific instructions and well-depicted visual details.

    Brad Long, aka the Home Builder

  2. I have a question regarding the installation of a metal roof (preferably a standing seam metal roof) over SIPS or Stress Skin Panels. I live in a post and beam (timber frame) home that is NOT enclosed with traditional stud framing, but utilizes stress skin panels. Is the installation of a metal roof different on this type of construction? Is there anything specific I need to be aware of when evaluating roofing systems?

    The metal shingle roofing guys I have spoken with have really undermined the quality of a standing seam metal roof. However, I am not sure if their ‘pitch’ is merely a way of ‘selling’ me on their particular roof system, because they do not do standing seam roofs. I’d like some objectivity, but am unsure of where to turn to get accurate information. I would appreciate your insight! Thanking you in advance!!

    1. Hey Anita,

      Ultimately, the quality of installation is more important than the system you choose, whether it’s metal shingles or standing seam. Although, the later will likely cost 20% to 30% more depending on the difficulty of your roof. One advantage of standing seam is that it’s PV solar ready, but there are some potential disadvantages having to do with installation on difficult and cut-up roofs, where installing standing seam may not be a such a good idea, while metal shingles may work perfectly fine.

      Here is a good article explaining it in a great detail.

      Here is another helpful article focusing on pros and cons of each system.

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