Home / Services / Exterior Construction
Exterior Construction · Exterior WaterproofingExterior Waterproofing in New Jersey
Finding where water gets into the walls above ground (at windows, doors, roof-to-wall joints and penetrations) and correcting the details that let it in.
NJ HIC #13VH12036000 | Serving homeowners across New Jersey from East Rutherford
- Free inspection & estimateNo-cost first visit
- NJ HIC #13VH12036000Registered Home Improvement Contractor
- East Rutherford headquarters168 Humboldt St
- Convenient online schedulingRequest online, then pick a time
Keeping water out of the walls above ground
The outside of a home is designed in layers. Siding and trim shed most water, but some always gets behind them. Housewrap, flashing and sealants are there to catch that water and send it back out. When one of those layers is missing or fails, water can soak sheathing and framing for a long time before anyone notices.
Our exterior waterproofing work focuses on these above-grade details: flashing at windows and doors, kickout flashing where a roof meets a wall, sealing around penetrations like vents, pipes and fixtures, and correcting how water drains off the walls.
A visit starts with tracking the water. Interior stains, peeling paint, rot or swollen trim are clues; we work backward to the likely entry point and explain what we see.
What this service does not cover
Basement and foundation waterproofing below grade, such as excavation, foundation membranes and interior drainage systems, is specialized work. If your problem is below ground, we will tell you so and suggest you consult a foundation or basement waterproofing specialist.
Where water gets into walls
These are the leak points we check most often on New Jersey homes.
Window and door openings
Missing or reversed flashing lets water behind trim and into the framing.
Missing kickout flashing
Water from a roof edge runs down the wall instead of into the gutter.
Failed sealant
Cracked caulk around vents, pipes, lights and trim joints.
Interior stains near walls
Water marks on ceilings or walls below an exterior wall joint.
Poor drainage
Downspouts and overflow soaking the lower wall and foundation line.
Wet sheathing
Swollen or stained siding and trim that point to trapped moisture.
Seal it or rebuild the detail?
Caulk has a role, but it is not a substitute for flashing.
When a smaller fix can work
- One clear entry point
- Sealant failure on an otherwise correct detail
- No damage to sheathing behind
- Flashing present and correctly lapped
When the detail should be rebuilt
- Flashing missing or installed backward
- Water damage to sheathing or framing
- Repeated leaks at the same spot
- Trim and siding need to come off anyway
Factors that affect the decision
Where the water enters, whether flashing exists and is lapped correctly, how much damage is behind the surface, and other work planned on the wall.
When further investigation is needed
Some leaks only show up in wind-driven rain or are hard to trace. Confirming the source may require removing siding or trim in a small area. We explain this before starting.
How exterior waterproofing works
Describe
Tell us where and when you see water, with photos if possible.
Trace
We inspect the exterior above and around the problem area.
Explain
We show you the likely entry points and what is behind them.
Estimate
You receive a scope for the flashing, sealing or rebuild work.
Correct
We open the area, repair damage and install flashing and seals correctly.
Close up
Siding and trim go back on; we review the finished work.
If the water source turns out to be the roof itself, we explain the roofing repair needed.
Waterproofing components
The parts of a wall that manage water. These are general options we can discuss.
Metal flashing
Head, step, counter and kickout flashing that direct water out and away.
Flashing tapes & membranes
Self-adhered materials used around windows, doors and penetrations.
Water-resistive barriers
Housewrap or similar layers behind siding that shed water that gets past it.
Sealants
Exterior-grade sealants for joints that move; used alongside flashing, not instead of it.
What Our Customers Say
We have not yet received Google reviews about exterior wall waterproofing specifically. These are genuine Google reviews about roof leak repairs.
Excerpt“Since the work was completed, there hasn’t been a single leak—even after heavy rain. The team was professional, efficient, and got the job done right the first time.”
Excerpt“After a couple of months and few rainy days, Matt was nice enough to follow up and asked if I had any leaks.”
Excerpt“Matt was polite, knowledgeable, and efficient. My roof looks great and no more leaks.”
Quoted from our Google Business Profile. Rating and count as of October 28, 2026.
Exterior waterproofing throughout New Jersey
Wind-driven rain affects homes everywhere in the state. We serve all 21 counties from East Rutherford, subject to availability.
Headquarters
168 Humboldt St, East Rutherford, NJ 07073
(551) 241-0470 · monarchroofingnj@gmail.com
Service availability can vary by location and schedule. See all service areas.
Exterior waterproofing FAQs
Do you waterproof basements?
No. Below-grade foundation and basement waterproofing is specialized work. We focus on keeping water out of the walls above ground.
Can caulk fix my leak?
Sometimes, if the detail is otherwise correct and the sealant has simply aged. If flashing is missing, caulk is only a temporary fix.
What is kickout flashing?
A small angled piece of flashing at the bottom of a roof-to-wall joint. It sends water into the gutter instead of down the wall.
Why does my wall only leak in some storms?
Wind-driven rain can push water into openings that stay dry in normal rain. Those leaks often point to flashing or joint problems.
Will you need to remove siding?
Possibly, in a small area, to see and correct the flashing. We explain where and why before doing it.
Can gutters cause wall leaks?
Yes. Overflowing gutters and short downspouts can soak walls and trim. Gutter fixes are sometimes part of the solution.
Is water-repellent coating the same as waterproofing?
No. Coatings can reduce absorption on some surfaces, but they do not replace flashing and proper detailing.
Is the inspection free?
Yes. We inspect and estimate at no cost.
Request Your Free Exterior Inspection
Tell us about your project, upload photos if available, and choose your preferred inspection date and time.
Please note: preferred dates and times are requests until your booking is confirmed.
Prefer to talk? Call or text (551) 241-0470 or email monarchroofingnj@gmail.com.
Water Getting Into Your Walls?
Tell us where you see water or staining and when it happens. We will start with a free inspection to trace the source.