Attic Insulation for DMV Homes: R-Values, Rebate Rules and the Right Order

By Max Fisher · Published 2026-10-15 · Updated 2026-10-18

Short answer. After the attic floor is sealed, bring the attic insulation up to the level ENERGY STAR recommends for the DMV: R-60 for an attic with little or no insulation, or an added R-49 on top of 3 to 4 inches already there. BGE’s Home Performance program requires attic air sealing and R-49 attic insulation before it pays equipment rebates, including for heat pumps.

This is step 3 of the Law of Sequence: measure, seal, insulate, then size and install.

Why insulation is step 3, not step 1

Insulation and air sealing do different jobs. The Department of Energy compares insulation to a sweater: it keeps heat in when the air is still, but it does not stop the wind. Air sealing is the windbreaker. In the attic the order matters physically too. Many of the worst leaks are in the attic floor, around lights, pipes, wires and the hatch, and once a thick layer of new insulation is blown over them, they are buried and much harder to reach.

So the sequence is: measure the house, seal the attic floor and other leaks, then insulate. Done this way, the insulation performs as rated, and the heat pump that comes next is sized for a house that holds its heat.

What R-value means

R-value measures how well a material resists heat flow. Higher is better. It depends on the material and its depth, which is why the same R-value can mean a different thickness of fiberglass, cellulose or spray foam. When you compare quotes, ask each contractor to state the finished R-value, not just the number of inches.

The recommended levels for the DMV

ENERGY STAR’s R-value table sets targets by climate zone. Check the ENERGY STAR map for your exact zone. For attics, the recommendation for zone 4A and zone 5 is the same:

Situation	Zone 4A	Zone 5
Uninsulated attic	R-60	R-60
Attic with 3 to 4 inches existing	Add R-49	Add R-49
Floor over unheated space	R-19	R-30

Source: ENERGY STAR recommended home insulation R-values.

The BGE rebate rule

On BGE’s Home Performance rebate page, heating and cooling equipment carries a footnote: the project must include attic air sealing and attic insulation to R-49. The page also notes that air sealing must be completed before insulation goes in. In practice, the program pays for the heat pump only when the attic is ready for one. Customers of Pepco, Delmarva Power, Potomac Edison and SMECO should check their own utility’s current rules, and your assessor or participating contractor can tell you whether your attic already qualifies.

Checking the work

Before photos: ask for photos of the attic floor sealing before any insulation goes in.
Depth markers: blown insulation should have depth rulers stapled to the framing so you can see the installed depth.
The hatch: the attic access should be insulated and weatherstripped, not left as a bare panel.
Clearances: insulation should be kept away from flues and from recessed lights not rated for contact, with proper dams. ENERGY STAR also warns that sealing a house can make combustion appliances backdraft, so have gas and oil appliances tested as part of the job.
Attic ventilation: soffit vents should be kept clear with baffles so the attic can still breathe.
The record: ask for a written record of the material, the area covered and the finished R-value.

What about walls and floors?

Walls are harder and more expensive to insulate in an existing house, so most programs start with the attic. For floors over unheated spaces such as crawlspaces and garages, ENERGY STAR recommends R-19 in zone 4A and R-30 in zone 5. Your assessment report should say which surfaces matter most in your house, and in what order.

Who does this work locally

Several companies in this directory say they do insulation along with heating work, including Complete Home Solutions in Lothian, High Performance Home in New Windsor, Atlas Home Energy Solutions in Frederick, Total Home Performance in Easton and American Home Builders in Middle River. The energy audits and air sealing page lists more.

Comfort you can feel

ENERGY STAR estimates that air sealing and adding insulation save homeowners an average of 15 percent on heating and cooling costs. Many homeowners notice the change first as comfort: upstairs bedrooms that stay cooler in summer and fewer cold drafts in winter. It is also the moment the heat pump decision gets simpler, because the house now needs less heating and cooling.

Problems to fix while the attic is open

An insulation job is the cheapest time to deal with other attic problems, because the space will be hard to reach once the new insulation is in. Before the contractor starts, walk through the attic with them, or ask for photos, and look for these:

Bath and kitchen fans that vent into the attic instead of outside. They should be ducted to the exterior so they do not dump moisture onto the new insulation.
Signs of moisture or mold on the underside of the roof deck, which point to a ventilation or leak problem to solve first.
Old wiring that is not safe to bury. Ask an electrician to look if anything seems damaged or out of date.
Ducts in the attic. If ducts run through the attic, ask whether they will be sealed and insulated as part of the job, since they sit in the hottest and coldest part of the house.
Pests. Droppings or nests in the old insulation should be cleaned out before new material goes in.

Fixing these first means the insulation keeps doing its job for years, and the heat pump that comes next is sized for a house that will stay the way it was measured.

Questions homeowners ask

How much attic insulation does a DMV home need?

ENERGY STAR recommends R-60 for an uninsulated attic in zones 4A and 5, and adding R-49 where the attic already has 3 to 4 inches. BGE’s Home Performance equipment rebates require at least R-49 in the attic.

Why should air sealing come before insulation?

Insulation does not stop air moving through gaps, and once new insulation is blown in, the leaks in the attic floor are buried and much harder to reach. Seal the attic floor first, then insulate over it.

Is attic insulation worth doing before a heat pump?

Usually, yes. The attic is often the easiest place to add a lot of insulation, and cutting heat loss through the ceiling lowers the load the heat pump has to meet, which can mean a smaller system.

What comes next

With the house measured, sealed and insulated, it is time to size and install the heat pump. Continue to step 4: sizing and installation.