6th Apr 2023

Restoring St Marylebone Parish Church

Watch Package Manager, Samuel James Wilson, explain how our Special Projects team restored the roof and 19th Century fibrous plaster ceiling at St Marylebone Parish Church.

At the start of 2021, our Special Projects team started work to restore St Marylebone Parish Church to its former glory and remove the building from the Historic England ‘At Risk’ register.

St Marylebone Parish Church is Grade I listed and a focal point for the local community in central London, providing vital services and initiatives for health, culture, and education. Built in 1817 and designed by Thomas Hardwick Jr in an era of elegance and opulence, the building narrowly survived World War II, suffering significant damage during the Blitz. 

St Marylebone Changing Lives, made possible in part by the National Lottery Heritage Fund, is one of the city’s largest and most significant community projects. The parish church works closely with a number of local and national organisations like AgeUK, Westminster Adult Services, the Alzheimer’s Society, Westminster Arts, The Church Army, the West London Mission, and the NHS (the Church Crypt houses the Marylebone Health Centre, which supports 10,000 NHS patients, and the St Marylebone HCC which provides counselling and psychotherapy).

In this short film below, Samuel James Wilson, Package Manager for Sir Robert McAlpine Special Projects, explains the techniques the project team used to repair the roof and restore the parish church’s magnificent 19th Century fibrous plaster ceiling. In order to undertake the works, they had to build a suspended flying birdcage scaffold providing full level access to the underside of the ceiling whilst having minimal impact on the nave of the parish church. Throughout the project, the church remained in service to support the community, aside from short periods when the scaffold was erected and dismantled.

Our Special Projects team worked alongside other specialist teams, including Hayles and Howe, Caroe Architecture, with the support of project directors Focus Consultants and quantity surveyors, Synergy LLP. They completed the restoration in December 2022. 

Restoring St Marylebone Parish Church

So the scope of works on the roof is really to return it back to its original state.
So what we came to discover is in the eighties
they put on an aluminium roof covering
which wasn't doing the roof any favours in the historic timbers inside.
So what we've done is stripped all the aluminium off
that was causing the roof to sweat underneath
and we replacing it back with the original design.
So that's using Welsh slate
and that’s also returning the central turret as per original photographs we have.
At the same time we're installing external insulation to the roof
to really futureproof the roof.
Also what we're doing is another future
proofing aspect is enlarging all the gutters and the outlets on the church.
So the gutters either side, East and West
and also the South have been rebuilt.
to basically take all the weight of the water
and all the velocity of the new water.
So as as climate change becomes more prominent and there's more rainfall
the church can also deal with that.
We found that the original was in fact from Wales itself.
So what we've tried to do is match as close as we can
to the historic slates with modern day slates.
So again, we've gone back to Wales, we’ve gone to the Penrhyn Quarry
and we taken the Welsh slates.
The slate on this project has actually been dug to a specification of colour.
So the client and the design team have chosen the specific colour and slate,
we’ve then ensured with communication with the quarry that we're digging
just that slate, and then as they dig it and let it dry, they deliver it to site.
So it's all returning the church to its former past
and bringing that story back to life.
What we're doing here is basically conserving the historic ceiling of the nave.
So what we're having to do is install two, it's a two ?
we’re installing supports above the ceiling
and we’re also replastering the ceiling from below.
The supporting was always meant to be part of the project,
but it wasn't until watching the project doing investigations we deemed
that the actual plaster below was coming away.
So we're having to do a full scheme of works below.
What you can see here is basically the plaster
supporting the historic ? plaster ceiling from above.
So we use stainless-steel trays, we use an activation serum
on the historic plaster and then put on new plaster.
So we're basically conserving the historic grabbing it up and supporting it.
So when we put on the new plaster below,
It's really got a solid base to go from.
What you can see here is the first finished bay of the plaster work.
So the plasterers are going through step by step on each bay, there’s four bays to complete.
Again, as I explained above, what we found when we came to the church
was the top skim of the plaster was delaminating.
So we've had to remove the top skim of plaster,
consolidate everything from above and from below and re skim it.
So because it's a lime construction of the ceiling
with lime plaster, we've put back a lime plaster back.
So the guys have worked tirelessly to get this on, this is the first finished one
and then we're just working step by step to finish the others.
  • Special Projects

    Our Special Projects team is dedicated to providing complex heritage restoration schemes with the technical excellence and expertise they deserve.

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