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


Baltimore Flat Roofs Roofing

TYPES OF FLAT ROOFS IN BALTIMORE CITY | Four Twelve Roofing – Flat Roof Specialists

If you are a homeowner in Baltimore City, you likely have what we call a “Flat Roof.”

Flat Roofs are tricky, as they are, by definition, flat. With little to no slope on a flat roof, it is hard to shed water, snow or debris, which means you need a Baltimore roofing contractor who is experienced when it comes to these types of installations, such as Four Twelve Roofing. Check What Others Are Saying About Our Services! 

flat roof specialists in Baltimore City


Modified Bitumen is the most common product used when it comes to Flat Roofs. Modified Bitumen goes by a couple of different names – rubber, torch down or tar. Tar is the old way of doing things. Typical old rowhomes will have a tin sheet metal cap, with many layers of tar roofing material on top of them. Newer Modified Bitumen roofs will be either rubber or torch down, which is Four Twelve’s preferred flat roofing product. It is cheap and typically has a lifespan of 20 years. It is usually laid in 2-3 layers, on top of the wooden roof deck, and your roofer will use a torch to heat up the glue or adhesive to get it to stick to your roof deck.


Silicone Coated roofs are typically applied on top of original modified bitumen roofs. Silicone coatings respond well to UV degradation and are water resistant. Typically we recommend doing a modified bitumen roof and then coming back 10-15 years after the installation to do a silicone coating. The UV protection will help in the summer months. UV rays are what degrades your roof most – not snow or tree branches – but rather the hot summer sun. Water resistance also means that when water ponds on your roofs surface, behind a skylight or a chimney, it will not find any seams to sneak through, as the silicone completely prevents this.


EPDM stands for Ethylene Propylene Diene Monomer and is basically the same material used to make bicycle tires. EPDM roofs are applied by mopping glue onto the roof deck and then laid flat, taping all seams and edges with a specialty tape. EPDM provides a cleaner look than modified bitumen, with less visible seams, but this material is easily punctured and thus, not as highly recommended as torch down.

Four Twelve has been a flat roof specialists with a 100% satisfaction rate from a Baltimore & Columbia roofing company. Contact us for more information. You may also 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) 989-73


Roof Repair Roof Replacement Roofing Shingles


If you live in Baltimore County, you likely have an Asphalt Shingle roof.

Asphalt Shingles have a lifespan of 20-50 years, when installed properly by a qualified roofing contractor. Asphalt Shingle roofs are the best product on the market for a pitched roof when it comes to cost-to-value and weather resistance. Asphalt Shingles also come in a variety of colors and design options. If you are looking for asphalt shingle roofing in baltimore, then call us.

photo of Asphalt Shingles


3 Tab Shingles are the most affordable type of Asphalt Roofing product. They are called 3 Tab Shingles because the individual pieces come in 3 tab pieces, with less styles and varieties compared to Architectural Shingles. 3 Tab Shingles are preferred for rental properties and homes with lower resale value. 3 Tab Shingles typically have a manufacturer’s warranty of 20 years.


Architectural Shingles are the most popular and commonly installed type of shingles available on the market today. Architectural Shingles have a more dimensional appearance than 3 tab shingles and look like “shake” shingles when installed. Architectural Shingles are heavier and thicker than 3 Tab Shingles and thus have a longer manufacturer’s warranty, typically 30 years. Architectural Shingles are preferred by most homeowners to 3 Tab Shingles and will typically increase the resale value of your home. They are becoming increasingly popular among homeowners.

When it comes to your roofing needs, be it asphalt, rubber, or any type of roofing materials you can count on Four Twelve Roofing to deliver. Apart from our roofing services, you may also rely on us for other property improvement services including but not limited to gutters and skylight. You may visit us at 10 E North Ave, Baltimore, MD 21218 for a personal consultation. Contact Us Today!

Call 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!