A full roof replacement includes tearing off the old shingles down to the wood deck, inspecting and repairing that deck, installing new underlayment, flashing, and shingles, correcting attic ventilation, cleaning up every nail, and backing the work with a written warranty. A fair scope leaves nothing out, and it leaves nothing hidden.
At Bella Construction, we have been replacing roofs across Irwin, the Norwin area, and greater Pittsburgh since 1995. Over those years we have seen too many homeowners handed a vague one line quote that simply says “new roof.” That kind of quote hides what is being skipped. Below is exactly what belongs in a complete roof replacement, so you know what you are paying for and what to expect from any contractor you hire.
Step one: tearing off the old roof
A proper replacement starts by removing everything down to the bare wood deck. That means stripping off the old shingles, the old underlayment, and the old flashing.
Some contractors offer to lay new shingles right over the old ones to save money. We do not recommend it in our climate. Layering over old shingles hides the condition of the wood underneath, adds weight, traps heat, and shortens the life of the new roof. A tear off costs a little more up front, but it is the only way to see and fix what is happening on the deck. To understand how this fits into the full range of work we do, see our roofing services page.
Step two: inspecting and repairing the deck
Once the old roof is off, we can finally see the plywood or plank decking. This is the part of the job you cannot inspect any other way, and it is where hidden problems live.
We walk the entire deck looking for:
- Soft or spongy spots that signal water damage
- Rotted boards around chimneys, valleys, and old leak areas
- Gaps, warping, or delamination in the plywood
- Nail holes and areas that will not hold fasteners
Any damaged decking gets replaced with new material before we go further. Shingles are only as good as the wood beneath them, so this step protects everything that comes next.
Step three: underlayment and ice barrier
With a sound deck in place, we install the layers that sit between the wood and the shingles.
- Ice and water shield goes along the eaves, in the valleys, and around penetrations. In Western Pennsylvania, ice dams are a real winter threat, and this waterproof membrane is your best defense against water backing up under the shingles.
- Underlayment covers the rest of the deck. It acts as a secondary barrier that keeps the deck dry during installation and adds a layer of protection for the life of the roof.
These layers are quiet heroes. You never see them once the job is done, but they are a big reason a roof survives our freeze and thaw cycles.
Step four: flashing
Flashing is the metal that seals the spots where the roof meets something else, like a chimney, a wall, a skylight, or a plumbing vent. It is also the number one source of leaks we find.
A complete replacement includes new flashing at every one of these transitions. Reusing old, corroded flashing to save a few dollars is one of the most common corners we see cut, and it almost always leads to leaks down the road. New step flashing, counter flashing, valley flashing, and pipe boots all belong in the scope.
Step five: the shingles
This is the visible part, the roof you actually see from the street. A quality replacement uses architectural, or dimensional, shingles rather than the old flat three tab style. They last longer, resist wind better, and look far nicer.
As an Owens Corning Platinum Preferred contractor, we install premium shingle systems that carry strong manufacturer warranties. The color and product line are yours to choose, and we will walk you through the options that suit your home and budget.
Step six: ventilation
Good attic ventilation is one of the most overlooked parts of a roof, and it directly affects how long the roof lasts. A roof that cannot breathe traps heat and moisture, which cooks shingles from below in summer and feeds ice dams in winter.
A full replacement is the right time to get this right. We check your ridge vents, soffit vents, and intake and make sure the system is balanced. Fixing poor ventilation now can add years to your new roof and lower your energy bills at the same time.
Step seven: cleanup
The job is not finished when the last shingle is nailed down. A complete replacement includes a thorough cleanup of your entire property.
That means hauling away all the old roofing debris, running magnetic rollers across your yard and driveway to collect stray nails, and leaving your home looking better than we found it. You should not be finding roofing nails in your grass weeks later. If you do, the cleanup was not done right.
Step eight: warranty and documentation
Finally, a real replacement comes with paperwork you can hold onto. That includes:
- The manufacturer warranty on the shingles and roofing system
- A workmanship warranty from the contractor covering the installation
- Documentation of what was done, which matters for insurance and resale
Because we are an Owens Corning Platinum Preferred contractor with a BBB A plus rating and PA license number 50898, we can offer enhanced system warranties that most contractors cannot. Ask any roofer to put the warranty terms in writing before you sign.
What a fair scope looks like
When you compare quotes, make sure each one spells out these items. If you are also weighing the total investment, our guide to roof replacement cost in Pittsburgh shows what moves the price and what a fair range looks like for our area. For an independent look at what a quality installation should include, the National Roofing Contractors Association publishes homeowner guidance you can trust.
A cheap quote often looks cheap because something on this list is missing. A fair quote is not always the lowest number. It is the one that includes the full job and stands behind it.
Frequently Asked Questions
How long does a full roof replacement take?
Most homes in our area are completed in one to three days, depending on the size and complexity of the roof and the weather. A larger home or one with steep slopes and multiple chimneys may take a bit longer. We give you a realistic timeline before we start.
Do I need to replace the plywood decking during a roof replacement?
Only if it is damaged. Most roofs have some rotted or soft decking around problem areas that needs replacing, but a sound deck stays. A good contractor inspects the deck after tear off and shows you any bad boards before replacing them.
Can you replace a roof in the winter in Pennsylvania?
Yes, roofs can be installed year round here, though very cold days require extra care so shingles seal properly. Many homeowners actually book fall and winter work to get ahead of spring storm season. We plan the job around the weather to protect your home.
What is the difference between a roof repair and a full replacement?
A repair fixes a specific problem, like a leak or a section of missing shingles, while leaving the rest of the roof in place. A full replacement removes everything down to the deck and installs a complete new roof system. Replacement makes sense when a roof is old or failing in multiple spots.
Get a clear, honest quote
You deserve to know exactly what you are paying for. Bella Construction offers free, no pressure roof inspections and detailed written quotes across Irwin, the Norwin area, and greater Pittsburgh. Call us at 724.515.5163 and we will walk your roof, explain the full scope, and leave nothing hidden.