Work was done efficiently quick. Workplace was clean after job.
— Robert P., West Lebanon, NH
Strafford County, NH
Strafford County sits where the tidal rivers meet the inland woods — damp air off Great Bay and the Piscataqua, dense mill-era housing in Dover, Rochester and Somersworth, and winters that punish every seam. Interlock ends the argument: aluminum, four-way interlocking, installed once and covered by a lifetime limited warranty for the original owner.
★ 4.7 average from 231 verified New Hampshire reviews
New Hampshire line: (603) 803-4998 · Toll-free 1-866-733-5811
Tidal air off Great Bay and the Piscataqua keeps north-facing slopes wet, and moisture that lingers is what shortens an asphalt roof and rusts the steel holding a metal one down. Interlock is aluminum throughout. It does not rust, and there is no exposed lap seam across the field of the roof for water to work into.
Dover, Somersworth and Rochester are full of tall, steep, close-set homes built when slate was standard — and slate runs roughly 8 to 10 psf. Interlock's aluminum slate profile installs at 0.41 psf, which means the historic line without the structural bill.
Around Durham especially, a great many roofs belong to someone who does not live under them. A roof with no maintenance schedule and the transferable Guardian Lifetime Limited Material Warranty is worth more than one that needs a trade scheduled every few seasons.
The panels shed snow rather than holding a saturated mat against the deck, and meltwater has no exposed seam to get under.
Gallery
Real homes, real installations — photographed after completion.

Madbury, NH
Deep Charcoal

Madbury, NH
Deep Charcoal

Madbury, NH
Deep Charcoal

Madbury, NH
Deep Charcoal

Madbury, NH
Deep Charcoal

Rochester, NH
Black

Rochester, NH
Black

Rochester, NH
Black
Reviews
Work was done efficiently quick. Workplace was clean after job.
— Robert P., West Lebanon, NH
Great work. He is the best
— Peter La M., Derry, NH
This has been one of our best investments ever. It wasn’t perfect when they finished but the after installation follow up has been. Navir always has been very professional, friendly and polite. I always have tried to tip him, he never accepts it but is grateful for the offer. I highly recommend this company.
— Jon T., Center Harbor, NH
They gave us a prompt response when our roof was damaged by a tree branch. Looks as good as new !
— John B., Chester, NH
Nazar was wonderful! I can’t thank him enough!
— Jeffrey Y., Hampton, NH
Naz, worked for hours non stop doing the repairs , He had a lot of stamina and knowledge on how to remedy any damage . Afterwards he showed me the finish product , I was and still am amazed as to the quality of his works
— Andy B., Barrington, NH
Barrington, Dover, Durham, Lee, Madbury, New Durham, Rochester, Somersworth, Farmington, Milton, Middleton, Rollinsford, Strafford
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