Parapets That Stay Sealed
Fully adhered membrane runs up the wall and under new coping, so the joint where most storefront leaks start gets a continuous seal.
Serving Onawa, IA
Onawa Commercial Roofing Contractor
Membrane For Parapet Storefronts, Steel For Sloped Shops And Sheds
Onawa commercial roofing starts with the shape of the building: we fit membrane to flat parapet roofs and steel panels to sloped shops.
Matching Onawa Commercial Roofing To The Building
Onawa commercial roofing comes down to slope and deck. Older storefronts with parapet walls tend to have flat roofs over wood or concrete, while shops and storage buildings stand on steel purlins with a pitch.
We sort each roof by slope, deck, and use before naming a system. A building with a flat front and a sloped shop behind can take both, joined at a flashed transition.
- Flat parapet roofs: fully adhered membrane
- Sloped purlin roofs: steel panels
- Deck type checked before attachment
- How the building is used
Storefront And Shop Problems Behind Commercial Roofing in Onawa
Flat fronts and sloped shops fail differently. These conditions point to each system.
You See
Water stains under the front parapet
Likely Cause
Old membrane has pulled away from the wall, and water runs behind the base flashing.
What We Do
Fully adhere a new sheet up the parapet and cap the wall with new coping.
You See
Water pooling behind the front wall
Likely Cause
Flat roofs over old wood deck sag between joists and trap water at the back.
What We Do
Add tapered insulation to move water to a drain or scupper at the rear.
You See
Rusted screw rows on a shop roof
Likely Cause
Dried washers on screw-down panels let water sit at each fastener.
What We Do
Replace the panels, or recover them with new steel on retrofit framing.
You See
Ice at the eaves of a sloped shop
Likely Cause
Snow melts on warm panels and refreezes over the cold overhang.
What We Do
Add snow guards and check insulation and venting under the new steel.
You See
Leaks at a rooftop unit over the sales floor
Likely Cause
Curb flashing on older storefront roofs stops short of the curb top.
What We Do
Flash the curb to full height as part of the new membrane.
What The Right Commercial Roofing System Gives an Onawa Building
Choosing by building type pays off for years. These are the gains.
Shop Roofs That Shed Snow
Steel on a pitched shop sheds snow and rain fast, and standing-seam clips let the panels move through temperature swings.
Attachment Matched To The Deck
Wood, concrete, and steel decks each take a different fastener or adhesive, and naming the deck first keeps the roof attached in wind.
One Plan For Mixed Buildings
When a storefront and shop share a building, both roofs are scoped together with a flashed joint between them.
Commercial Roofing Systems We Install in Onawa
Four systems cover nearly every building type in town. Each card names where it goes.
Fully Adhered EPDM On Parapet Roofs
Rubber glued to cover board handles flat storefront roofs with tall walls and few seams, and it stays flexible through winter.
White TPO On Larger Flat Roofs
Welded TPO fits bigger flat buildings where summer heat over the floor matters and long, open runs suit wide rolls.
Standing Seam On Sloped Shops
Hidden clips and raised seams fit shops and storage buildings where you want fewer exposed screws to maintain.
Screw-Down Panels On Sheds
Exposed-fastener steel is the lower-cost fit for sheds and storage, with screw checks every few years.
Leak Behind A Storefront Parapet?
Water that shows up just inside the front wall tends to start at the parapet flashing. Call us and we will look at it.
Commercial Roofing Steps for an Onawa Storefront Or Shop
The same five steps, adjusted to whether the roof is flat or sloped.
- 1
Inspect Your Roof
We measure slope, find the deck type, check parapets and purlins, and take core cuts on flat sections to test the insulation.
- 2
Name The System By Section
Flat parapet roofs get membrane, sloped steel roofs get panels, and any joint between them gets a flashing detail drawn into the scope.
- 3
Stage Out Of Customer Paths
Roof materials and the dumpster go behind the building or along a side street, clear of customers and deliveries.
- 4
Install And Flash
Membrane goes up the parapets and under coping; panels go on clips or screws with trim and closures at every edge.
- 5
Walk The Finished Roof
Together we check walls, seams, trim, and drains, and note anything the local building official needs to see.
Nearby Towns We Work In
Along with Onawa, we replace commercial roofs in Sioux City and four more towns nearby.
Not on the list? Call us or send us a message.
Pricing And Insulation Planning
- Sergeant Bluff
Roofs priced by size, layers, and insulation.
- Alton
Insulation planned to the energy code at reroof.
Questions About Commercial Roofing in Onawa
Answers for Onawa owners choosing between systems.
Which commercial roofing systems suit Onawa businesses?
Most Onawa buildings fit one of two paths: TPO or EPDM on flat roofs, and steel panels on sloped shops and storage. Older storefronts with parapet walls take a fully adhered membrane well, and metal buildings on purlins take new steel. Slope, deck, and use decide it.
What does commercial roofing for Onawa businesses with parapet walls involve?
Tear-off of the flat roof, new insulation sloped to the rear drain or scupper, and membrane run up every parapet wall. The coping comes off and goes back on over new flashing, which is where storefront leaks start. Neighboring buildings that share a wall get protected during the work.
How do I choose a commercial roofing contractor near Onawa?
Choose one who installs both membrane and metal, so the system follows your building instead of the other way around. Ask for Iowa contractor registration, a written scope naming the system and insulation, and a plan for the joint where a flat roof meets a sloped one.
Can a flat roof be converted to a sloped metal roof?
Often, with retrofit framing that builds slope on top of the old roof and carries steel panels. The old roof has to be dry enough to stay, and the walls and parapets have to work with the new height. We check both before pricing it against a new membrane.
Which lasts longer on a shop, screw-down or standing seam?
Standing seam, in most cases, because it has no exposed screws to dry out. Screw-down steel can still run a long time when washers are checked and replaced on schedule. The slope, budget, and how long you plan to own the building settle the choice.
Hire an Onawa Commercial Roofing Contractor
Tell us whether the roof is flat, sloped, or both. We check the deck and parapets and price the system that fits.