Baltimore Roof Replacement Roofing


The first step in replacing your roof, as a resident in Baltimore, is identifying whether you live in Baltimore City or Baltimore County.

image of a roof replacement job in Baltimore


If you live in the city, more than likely you have a “Flat Roof.” Flat roofs typically have little to almost no pitch from front to back. These come in multiple forms – Modified Bitumen (which has a few different forms), Silicone Coatings or EPDM. To learn more about Flat Roofs, click here.


If you live in the county, you likely have a pitched roof, and pitched roofing material comes in many different forms – cedar shake, metal paneling, slate shingles or what is most common (~85% of homes) – asphalt shingles. To learn more about Asphalt Shingles, click here. You may also visit us at 10 E North Ave, Baltimore, MD 21218 for a personal consultation!

When selecting Baltimore City roofers, it is important to know whether you have a Flat Roof or a Pitched Roof. This will dictate the scope of work and the contractor you select to perform your roof replacement. Make sure your roofer has experience working on flat roofs or pitched roofs before electing to go with them. Check What Others Are Saying About Our Services! 


Call Your local roofers in Baltimore – Four Twelve Roofing Today for a FREE ESTIMATE
Baltimore’s Local, Trusted Roofing Contractor.
(410) 989-7343


Flat Roofs Roofing



Good morning – to every Baltimorean living in Hampden on down to Federal Hill !

Today we are going to share some professional insights on what to look for when inspecting your Baltimore City flat roof. To learn about different types of Flat Roofs. If you need a Baltimore roofing specialist, Contact Four Twelve today.

Below are 3 things to look for, which are the most common problems we see on a daily basis with when repairing and replacing flat roofs in Baltimore City.


image of roofing workers cleaning roof

1. Layering

The first thing we do at Four Twelve, when climbing on a flat roof in Baltimore City, is pull back the gutters and inspect the number of layers of roofing material present on top of the roof. Many rowhomes were originally constructed with a sheet of tin metal roofing. Over time, these tin roofs were covered up with layer upon layer of black roofing material taking various forms – tar, rubber, asphalt, etc. In Baltimore City, it is not uncommon to see the original tin roof peeking out from under 6 layers of material. If your roof has been building up many layers over time, it is not a bad idea to get a roofing professional out to your home to take a look.

A few layers is common, but to overdo this practice – by adding 3+ layers on a roof, leads to other negative side affects. One, the sheer weight of 5-6 layers of roofing material puts serious strain on the structure of your home. Additionally with each successive layer of roofing material, the install is less effective. If your roofing material has ripples and you lay next layer perfectly on top of this layer, it does not even matter. The underlying ripples will force the new layer to pop up, as it is in the photo below. The glue is not strong enough to combat the underlying materials defects.

Rowhome roof in Federal Hill. The original tin cap is rusted orange underneath. On top are between 6-8 layers of rubber, tar and torch down roofing material.

2. Alligator Skin

If you own a rowhome in Baltimore City, it is a +90% bet that you have what is called a Torch Down Rubber Roof on top of your home. This material is a quality product, but over time the rain and sun can degrade this product by stripping it of its asphalt coating and drying up the rubber material. When this happens to Torch Down Rubber Roofs, the material begins to splinter and crack – a symptom we call Alligatoring, as it starts to look like the skin of an Alligator. Prolonged cracking and splitting of rubber roof material means that your roof is nearing the end of its life cycle.

If you are able to catch alligatoring before it spreads, you can do what we call a silicone coating (learn more about this product here). But if the alligatoring is too pronounced, like it is in the photo below – then you will have to tear off and replace it the roofing material. The way to determine this, is to take a walk on your Baltimore flat roof and see if the paper is dried up and cracking under foot. It will have lost its adhesion from UV exposure and not be firmly secured on the underside. If the paper is crunching and giving underfoot – then the material is susceptible to punctures and silicone coating is no longer an option.

a pic of a damaged flat roof

Alligator Skin, a symptom every Baltimore City homeowner should be aware of. If you see this, it means that your Flat Rubber Roof is nearing the end of its life cycle.

3. Ponding Water

Torch Down Rubber Roofs must be installed properly in order for the homeowner to realize its full benefit. Oftentimes, a subpar install will create valleys of poor drainage and water may pool behind a skylight or chimney. While rubber roofs are thick, AND shed water effectively (when sloped), they can be porous if exposed to ponding water for extended periods of time. This is the 3rd no-no of rubber roofs – make sure there are no spots where water is ponding.

The spots that are most susceptible to ponding on Baltimore City flat roofs are behind skylights, chimneys and any other roof penetrations. The best way to prevent ponding next to a roof penetration, is to have your roofing build what is called a “cricket” behind the penetration. A cricket is a little triangular hill that sits on the upslope side of the penetration, and aids in the movement of water as it rolls downhill on your flat roof.

image of a flat roof in Baltimore done by Four Twelve

Ponding water is defined as water that sits on your roof’s surface for more than 48 hours. Flat roofs have difficult draining, as they don’t have great slope to shed water. Ponding water must be addressed early if spotted.

Let Four Twelve Be Your Solution
For Baltimore Flat Roof Repairs and Replacements

I can’t tell you how often I hear it – people can’t seem to find the right solution for their flat roofs in Baltimore. The flat roof is inherently a tricky product – with little to no slope – they don’t shed water or debris as effectively as sloped roofs, also there is significantly less margin for error when installing a flat roof.

If you have a flat roof in Baltimore we’d love to help you. Let us come out, inspect it and provide a professional opinion, complete with photographs and a free estimate for the repair or replacement necessary to get your roof in good working order.

All work we perform on flat roofs comes with a 3 year warranty on workmanship and a 15-20 year manufacturer’s warranty on material. Every one of our flat roof installations start and finish within 1 week. We also benefit from being a small business with less overhead, allowing us to be competitive in our pricing for roofing services.

When it comes to your roofing needs, whether flat roof or pitched roof, you can depend on Four Twelve Roofing for assistance. Aside from that, we also specialize in other property improvement and renovation services, including but not limited to gutters and skylights. Contact us today or visit us at 10 E North Ave, Baltimore, MD 21218 for a personal consultation!

Call Four Twelve Roofing Today for a FREE ESTIMATE
Baltimore’s Local, Trusted Roofing Contractor.
(410) 989-7343


Construction Four Twelve Roofing Roofing

A YEAR IN VIDEOS (2017) | Four Twelve Roofing

In some of our projects were lucky enough to have the cameras rolling (and the batteries charged), so here is a look at a few of the projects that Four Twelve Roofing worked on this past year.

Ever wonder what it takes to build a new foundation for a home, well sit back and enjoy as we chronicle the start to finish.

Tiling, marble, vanity – watch as we take this bathroom remodel to completion from the ground up!

Baltimore Community Involvement Creativity


As part of our project at 1600 Barclay, Four Twelve Roofing set a simple and seemingly attainable goal – to create one full time hire from within our community. Through the first quarter of this project, we have exceeded this goal and created 3, 30+ hour/week positions for young apprentices.

When entering the homebuilding industry, it is hard to find work if you don’t have experience. Under the tutelage of our experienced carpenters and foremen, we have been able to work with our apprentices for the better part of this year – teaching them all facets of homebuilding. Four Twelve self-performs most of our own work, which allowed us the opportunity to train our apprentices in roofing, siding, masonry, framing, interior carpentry and painting.

Four Twelve’s close relationship with the local community has been helpful in making this program succeed. Through our time in Greenmount West, we have gotten to know our neighbors, community leaders and workforce training programs – such as Project JumpStart, a local Baltimore Workforce Development program. These apprenticeship positions have been invaluable to date – providing quality on-the-job training in addition to good paying and reliable work. Here’s to 3 more homes and continuing to build the locally trained, locally sourced laborpool in Greenmount West and Baltimore.

a mural on the wall

Construction Four Twelve Roofing

1600 BARCLAY MODEL HOME READY | Four Twelve Roofing


After 6 months of construction, Four Twelve Roofing is happy to deliver its first home as a part of the 1600 Barclay development project. This home is a product of 1,000 hands, hearts and ideas throughout Baltimore. Thank you to everyone who met with us to discuss our project or who worked on it directly.

We will be hosting an Open House with wine, beer and small eats on Tuesday, October 3rd from 4pm – 7pm. Come by, hang for a bit and get a tour of our first finished home – it would be a pleasure to have you!

This home is also officially for sale (woooo!). For anyone interested in living in this wonderful space, please visit our MRIS listing to learn more. Below we have thrown in some finished photographs to give you a taste of how this home turned out.

Looking forward to seeing folks on October 3rd or any other time you would like to come by and visit!

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