Roofing in Commerce Michigan

Home » Roofing » Roofing in Commerce, MI

One Property, Several Roofing Systems

The material conversation for roofing Commerce MI homes rarely has one answer, because these houses rarely have one roof. A cottage core at a steep pitch, a sunroom at almost no pitch, an addition somewhere between, and a detached structure near the water are four different specification problems on one parcel.

A quote listing a single shingle for the whole property has either simplified something or is about to install the wrong material somewhere.

What Open Water Does to Shingle Selection

Persistent wind is the defining exposure condition on the lake side, and it is different from storm wind. Storms come and go; a lakefront elevation gets worked at continuously.

What that argues for: architectural shingles as a minimum, installed to the manufacturer's high-wind nailing pattern rather than the standard count. Heavier profiles are worth pricing on properties with long open fetch across the water, since mass genuinely helps.

Equally important and cheaper: purpose-made starter strip at eaves and rakes, drip edge at every perimeter edge, and properly fastened ridge caps. Wind gets under edges, not into the middle of a field. Perimeter detail is where the rating is either achieved or lost.

Membrane Systems for Low-Slope Sections

Sunrooms, enclosed porches, and rear additions on lake homes are frequently built low-slope to preserve a view or a ceiling line. Below roughly a 2:12 pitch, asphalt shingles are the wrong material regardless of quality, because water sits at the laps rather than shedding.

Those sections need a continuous waterproof surface. Modified bitumen in sealed rolls is the common answer and handles standing water without complaint. Single-ply membrane works on larger low-slope areas.

The detail that determines whether it lasts is the junction where the low-slope section meets the taller wall. Membrane has to carry up that wall and be flashed over properly. A perfect field with a poor wall termination leaks at the wall and looks like the membrane failed.

Ice-and-Water Coverage Near the Lake

Self-adhering membrane at eaves extending past the interior wall line, in valleys, at every junction between sections, and around every penetration.

The lake-facing elevation deserves particular attention. Higher humidity means more ice at that eave in winter and more freeze-thaw cycling. If the coverage is going to be generous anywhere on the house, that is the slope where it earns its cost.

On a layered house, the seams between sections also warrant membrane treatment beyond code minimum, since those junctions are the most likely failure points regardless of what goes on top.

Ventilating a Winterized Cottage

This is the ventilation problem specific to Commerce, and it is different from a conventional attic or a purpose-built vaulted ceiling.

When a seasonal cottage gets winterized, insulation goes in wherever it will fit. Sometimes into an attic, sometimes against the roof deck, sometimes into a knee-wall cavity that connects to nothing. Then an addition arrives with its own separate roof cavity, and later another one.

The result is a house with several disconnected roof spaces, some ventilated, some not, none of them communicating. Ridge vent on one section does nothing for a cavity on the other side of a seam. Intake at a soffit that was enclosed during the 1970s remodel does nothing at all.

Assessing this means checking each cavity independently and building a ventilation plan per section rather than for the house. On a converted cottage that is genuinely more work than on a standard home, and it is why a quote that lists one ridge vent line item has not looked closely.

Shingle Grades Worth Considering on the Water

Architectural shingles

The baseline on the main roof. Laminated construction, real wind ratings, and warranties that reflect it.

Heavier and designer profiles

Worth pricing on exposed lakefront elevations where wind is constant, and on properties where the roof is highly visible from the water.

Three-tab

Occasionally defensible on a detached shed. On a lakefront main roof it is a false economy that shows up quickly on the water side.

We install as a CertainTeed Master Shingle Applicator, which determines the manufacturer warranty coverage available.

Decking Across Different Build Eras

Expect to find more than one deck material on a converted cottage. Plank sheathing in the original section, plywood from an eighties addition, OSB from anything recent.

Each takes fasteners differently and each has aged differently. Wide-gapped plank may need a thin overlay before modern shingles can be properly fastened and warranted. This should appear as a priced contingency in your quote, since it is genuinely unknowable until the roof is open.

Gutters on a Wooded Waterfront Lot

Large mature trees on Commerce lots fill gutters faster than most homeowners plan for, and lake properties add a wrinkle: where roof water discharges matters more when the ground slopes toward the water.

Downspouts that dump against a foundation on a sloped lot send water exactly where you do not want it. Extensions and proper discharge placement are worth getting right during a reroof rather than after.

Where an addition roof drains onto a lower section, a diverter or kickout keeps that concentrated flow from cutting a channel through the shingles below.

What a Complete Commerce Roofing Quote Includes

• Tear-off and disposal, listed by section
• Deck inspection with plank overlay priced as a contingency
• Ice-and-water shield at eaves, valleys, section seams, and penetrations
• Synthetic underlayment across the field
• Shingles named by line and color, installed to high-wind specification
• Separate membrane specification for every low-slope section
• Step and kickout flashing at all roof-to-wall junctions
• Ventilation plan stated per roof cavity, not per house
• Outbuildings if included
• Access and staging plan, cleanup, magnetic sweep, and township permit

Industry Certifications

Frequently Asked Questions

Why does my quote list two or three different materials?

Because your property has two or three different slopes. That is correct specification, not padding.

Can shingles go on my sunroom?

If the pitch is below about 2:12, no. It needs a membrane system. Shingles there are why the ceiling stains.

My cottage has several attic spaces that do not connect. Is that normal?

Very, on a converted property. Each one needs its own intake and exhaust. A single ridge vent does not serve cavities it cannot reach.

Does the lake side really need different treatment?

It benefits from it. Persistent wind, more moisture, and more sun all concentrate on that elevation, and it commonly fails years ahead of the road side.

What if there are three kinds of decking up there?

Expected. Each section gets assessed on its own, and any needed overlay should be priced as a contingency in advance.

Get a Roofing Quote in Commerce

Free inspection covering every section, elevation, and outbuilding, with a ventilation assessment for each roof cavity.

Call 734-367-4867 or request an estimate online.