Roof installation in New Jersey
A new house, or an addition that has to meet the roof you already have. We build the roof from the deck up and tie it into the existing roof where the two meet, so the joint does not turn into the leak. We do this on houses in 14 New Jersey counties.
NJ HIC 13VH13268400 · Licensed and insured · Free inspection · Open 24 hoursModern Home Roofing & Chimney puts roofs on new houses and additions in 14 New Jersey counties under NJ HIC license 13VH13268400. We build the roof from the deck up, and on an addition we tie it into the existing roof where the two meet. Every new roof starts with a free inspection, photos and a written estimate.
Why the joint between old and new matters most
On an addition, the open part of the new roof is the easy part. The trouble spots are the valley where the new roof meets the old one and the wall where it runs into the house. On a new build, those spots get covered by siding and trim soon after, and nobody looks at them again until something leaks.
A bad tie in usually shows up in the first hard rain, as a stain on a brand new ceiling after the drywall and paint are done.
When to call us about a new roof
- You are putting on an addition and its roof has to meet the roof you already have.
- You are building a new house and the framing is ready for a roof.
- The roof deck is up and needs to be covered before the weather turns.
- Part of the addition is flat or low slope, like a porch or a back room.
- The existing roof is getting old and you want to know whether to redo it at the same time.
Already have a roof that is worn out? That is a different job. The old roof comes off down to the deck first, and we price it that way. How roof replacement works
How a roof installation works
A roof installation with us runs in six steps. The deck gets checked before anything covers it, and your written estimate lists how long the work will take.
We come out and look, free
We look at the new framing and deck, and on an addition, at the existing roof the new one has to meet. We photograph what we find.
You get a written estimate
Scope, materials and the price, on paper. If we find a problem that changes the scope, we stop and show you before we touch it.
We check the deck
A roof is only as good as the wood under it. If a board is soft, loose or missing, you see photos before anything covers it.
We tie into the existing roof
Where an addition meets the house, we lift the old shingles along the joint and work the new roof in under them, with flashing along any wall, so water crosses the joint without finding a seam.
We build the new roof
Ice and water membrane along the eaves and in the valleys, synthetic underlayment over the rest of the deck, drip edge and flashing, then the shingles and the ridge cap.
We clean up and walk you through it
We run a magnet over the lawn and driveway for nails before we leave. Then we go over the finished roof with you, with photos.
Where an addition roof meets the house
Most leaks on a new addition start where it joins the house, not out in the middle of the new roof. These are the spots that need the most care.
The valley
Where the addition roof and the main roof meet at an angle. Water from both slopes runs through it, so a small gap lets in a lot of water.
The wall line
Where the addition roof runs into a wall of the house. The flashing has to tuck in behind the siding. Caulk alone does not last.
The old shingles at the joint
Older shingles get brittle. They have to be lifted with care so the new roof can go in under them without cracking the old ones.
Runoff onto the old roof
When a gutter on the addition drains onto the main roof, that stream of water wears a strip of shingles faster than the rest.
Attic airflow
The attic over an addition needs air coming in low and going out high, the same as the main house, or it traps heat and moisture.
Planning an addition?
Get a free inspection
What else to decide with an addition roof
Should the old roof be redone too?
If the existing roof is near the end of its life, a new addition beside it will look different, and the old side will need work soon anyway. We look at both at the inspection and tell you what we see. You decide.
Where your house is changes the roof
A roof near the shore and a roof up in Sussex County wear out for different reasons. In Ocean and Monmouth, wind off the water lifts shingle edges. Farther north and west, ice builds along the eaves. How a new roof gets fastened and sealed depends on where your house is.
Related work
Part of the addition is low slope? That takes a different system: Flat Roofing. The addition needs gutters too: Gutter Installation. Walls to cover? See Siding Installation. Attic over the addition? See Roof Ventilation.
Check us out before we start on your new roof
It depends on the size and pitch of the roof, how many valleys and walls it has to meet, whether it ties into an existing roof, and the shingle you pick. A small addition and a whole new house are nowhere near each other. We do not quote over the phone. You get a written price after we have been out.
Then you need the old roof taken off before a new one goes on. That is a replacement, not a new install, and it has its own page. We tell you which one your house needs after we have been up there, and you see the photos.
Yes. On an addition, that is where most of the care goes. We lift the old shingles along the joint and work the new roof in under them, with flashing along any wall it runs into, so water crosses from one roof to the other without finding a seam.
Sometimes it makes sense. If the existing roof is near the end of its life, the old side will need work soon anyway, and it will not match the new roof. We look at both and tell you what we see. Both can go on the estimate, so you can see each price and choose.
Yes. Porches, garages, additions and other flat or low slope sections need a different system than a shingle roof, because shingles need slope to shed water. We price them that way. Tell us at the inspection and the flat section goes on the same estimate.
An addition is new construction, so it goes through your town building department, and the roof is part of that work. Whether the roofing is covered under your builder or under us is written into the estimate before work starts, so nobody is guessing later.
We put roofs on new houses and additions in Bergen, Essex, Hudson, Hunterdon, Mercer, Middlesex, Monmouth, Morris, Ocean, Passaic, Somerset, Sussex, Union and Warren counties. If your town is in one of those, we can come out.
Find out what your new roof will take
Tell us about the house or the addition. We come out, look at it for free, and give you photos and a written price. If the old roof should be redone at the same time, you will hear that from us. If you hire someone else, you owe us nothing.
Open 24 hours · NJ HIC 13VH13268400 · Licensed and insured