“Mussi came out, had a proper look, and told us what was worth fixing and what wasn't. It was pretty straight-up, which we appreciated.”
Andrew M.Body Corporate · Auckland CBD
New Zealand · Engineered Waterproofing Systems
Watertight, by design.
Commercial, multi-residential and architectural flat roofs across Auckland. We reply the same working day, and the site visit and written quote are both free.
- Licensed Building Practitioner
- 5-year workmanship warranty
- Flood-tested before sign-off
Five services. One specialism.
The right approach depends on substrate, slope, exposure and how long the roof needs to last. We install across the full range, repair what's already there, and recommend without bias.
Warm roofs
20-yr warranty
Insulation above the deck, membrane above that. The build-up that stops condensation.
Learn more →Leak repairs
Per-job warranty
Targeted fault-finding and repairs on existing membrane roofs. Moisture mapping and condition reports where needed.
Learn more →TPO membrane
20-yr warranty
Single-ply, heat-welded, heat-reflective. The default for most new commercial flat roofs.
Learn more →Torch-on membrane
15-yr warranty
Two-layer SBS bitumen, flame-bonded. Robust under foot traffic and complex detailing.
Learn more →Liquid waterproofing
15-yr warranty
Seamless, brushed or rolled on. The answer where a sheet membrane won't lay flat.
Learn more →Warm roofs
20-yr warranty
Insulation above the deck, membrane above that. The build-up that stops condensation.
Learn more →Leak repairs
Per-job warranty
Targeted fault-finding and repairs on existing membrane roofs. Moisture mapping and condition reports where needed.
Learn more →TPO membrane
20-yr warranty
Single-ply, heat-welded, heat-reflective. The default for most new commercial flat roofs.
Learn more →Torch-on membrane
15-yr warranty
Two-layer SBS bitumen, flame-bonded. Robust under foot traffic and complex detailing.
Learn more →Liquid waterproofing
15-yr warranty
Seamless, brushed or rolled on. The answer where a sheet membrane won't lay flat.
Learn more →Compliance & certifications
- Licensed Building Practitioner
- CodeMark certified
- SiteWise Gold 2026/27
- Producer Statement Author
- NZBC E2/AS1 compliant
Built with the systems we trust.
How it works
See how our waterproofing system works.
A simple visual breakdown of the layers that protect your building from water, heat loss, and long-term roof damage.
Five steps. Documented at each stage.
A repeatable engineering process from first site visit to final sign-off. Keep scrolling to walk through it.
Step 01 — Inspection
Site visit. Substrate, slope, falls, drainage and existing detailing are assessed and documented.
Step 02 — Diagnosis
Cause-of-failure analysis where leaks exist. Condition report with moisture mapping if needed.
Step 03 — System recommendation
Membrane system matched to substrate, exposure, traffic, and warranty requirement. Written quote within 5 working days.
Step 04 — Precision installation
Installed to NZBC E2/AS1 and manufacturer spec. Every seam welded and probe-tested on the day.
Step 05 — Quality assurance
Flood test and final inspection. Producer Statement, manufacturer warranty, and our 5-year workmanship warranty issued in writing.
Why MRS
Membrane roofing, engineered to specification.
Run by Mussi Jorge Rosa — Licensed Building Practitioner with 12+ years on roofs across New Zealand. Every install is documented, tested and signed off by the person who put it down.
- Licensed Building Practitioner — Roofing
- SiteWise rated
- Flood-tested before sign-off
- Producer Statement (PS3) at hand-over
- Free site visits, written quote in 5 working days
- 5-year workmanship warranty
Mussi Jorge Rosa
Founder · LBP Roofing
Testimonials
What our clients say.
Feedback from recent membrane roofing projects across Auckland.
“The TPO job was tidy. We had other trades on site at the same time and they worked around it without making a fuss.”
James R.Commercial Builder · West Auckland
“We had no idea what a warm roof actually involved. They talked us through the insulation and membrane options in plain English.”
Sarah L.Homeowner · Grey Lynn
“Mussi came out, had a proper look, and told us what was worth fixing and what wasn't. It was pretty straight-up, which we appreciated.”
Andrew M.Body Corporate · Auckland CBD
“The TPO job was tidy. We had other trades on site at the same time and they worked around it without making a fuss.”
James R.Commercial Builder · West Auckland
“We had no idea what a warm roof actually involved. They talked us through the insulation and membrane options in plain English.”
Sarah L.Homeowner · Grey Lynn
“Good level of detail on falls, upstands, and drainage. Not flashy, just the sort of practical input you need before drawings get too far along.”
Michael T.Architect · Auckland
“The main thing I noticed was the detailing. Outlets, upstands, penetrations — all the little bits that usually cause headaches were done properly.”
Oliver B.Project Manager · Mt Eden
“They found the leak after two earlier attempts by others hadn't solved it. We have had some heavy rain since and it has stayed dry.”
Rebecca H.Property Manager · Newmarket
“Good level of detail on falls, upstands, and drainage. Not flashy, just the sort of practical input you need before drawings get too far along.”
Michael T.Architect · Auckland
“The main thing I noticed was the detailing. Outlets, upstands, penetrations — all the little bits that usually cause headaches were done properly.”
Oliver B.Project Manager · Mt Eden
“They found the leak after two earlier attempts by others hadn't solved it. We have had some heavy rain since and it has stayed dry.”
Rebecca H.Property Manager · Newmarket
“Tenants were still in the building, so we needed the job kept calm and clean. Communication was good and we didn't get complaints.”
Daniel K.Commercial Owner · Parnell
“The photos helped a lot. I could see what they were talking about, approve the maintenance, and not spend a week going back and forward.”
Chris P.Facilities Manager · Auckland
“Paperwork was actually organised, which is not always the case. Photos, warranty info, sign-off — it was all there when we asked for it.”
Nathan S.Developer · Ponsonby
“Tenants were still in the building, so we needed the job kept calm and clean. Communication was good and we didn't get complaints.”
Daniel K.Commercial Owner · Parnell
“The photos helped a lot. I could see what they were talking about, approve the maintenance, and not spend a week going back and forward.”
Chris P.Facilities Manager · Auckland
“Paperwork was actually organised, which is not always the case. Photos, warranty info, sign-off — it was all there when we asked for it.”
Nathan S.Developer · Ponsonby
Common questions.
Everything we get asked most often — quoting, warranty, licensing, what we install.
Who runs Membrane Roofing Systems?
MRS is owner-operated by Mussi Jorge Rosa, a Licensed Building Practitioner (Roofing) with 12+ years on membrane roofs across New Zealand. Mussi personally handles every job from initial site visit through to flood-test and hand-over.Are you licensed?
Yes. MRS holds an LBP — Roofing licence and is SiteWise Gold 2026/27 rated. All installs are signed off with a Producer Statement at hand-over.How quickly will I get a quote?
Written quotes are issued within 5 working days of the site visit. A site visit can usually be booked the same week the request comes in.What warranty do I get?
Three layers of cover: MRS 5-year workmanship warranty on the install (2 years on leak repairs); manufacturer system warranty of 20 years for TPO and warm roofs or 15 years for torch-on and liquid waterproofing; plus a per-job warranty on leak repairs because cover depends on the condition of the existing roof.Do you do residential or commercial roofs?
Both. Most of MRS's work is commercial and multi-residential, but MRS also does high-quality residential flat roofs where the architecture calls for it.Where do you work?
Based in Auckland and works across the Auckland region as standard. MRS also takes commercial and multi-residential work across the rest of New Zealand — past projects include Dunedin Public Art Gallery and Otago Boys High School.