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Roof repairs · Clonsilla, Dublin 15

Extension Roof Repairs & Dry Verge Installation in Clonsilla

Extension roof repairs in Clonsilla, Dublin 15: renewed ridge mortar, sealed valley joints, Mariseal Detail waterproofing at roof junctions and new dry verge covers.

Finished ridge pointing and waterproofed extension roof channel in Clonsilla
After: the repaired ridge line and waterproofed roof channel alongside the existing rooflights.

What needed attention

Following an inspection at this Clonsilla home, the extension roof needed attention at the ridge caps, valley and adjoining roof junctions. The photographs show worn mortar around the ridge caps and leaves, moss and debris in the roof channels. These are important details for keeping rainwater out and allowing it to drain away. The scope covered repairs to the existing roof and its vulnerable junctions.

How we approached it

We inspected the ridge caps and removed loose, cracked and worn pointing before renewing the mortar and filling the joint cracks. Ridge caps cover the joint where the roof slopes meet; repointing renews the exposed mortar around them. We cleared debris from the valley, inspected the existing flashing and sealed the joints and seams with roofing sealant. After cleaning and preparing the critical roof junctions and vulnerable leak areas, we applied Mariseal Detail liquid waterproofing. We also fitted dry verge units along the roof edges: mechanically fixed covers that protect the exposed tile ends. To finish, we cleaned the work areas, cleared job-related waste from the gutters and removed the work debris from the site.

The finished work

The finished photographs show renewed mortar around the ridge caps, cleared and sealed roof channels, waterproofing at the treated junctions and a continuous line of dry verge covers along the extension roof edges. The work focused on repairing and protecting these details while retaining the existing roof covering. The before-and-after sequence makes it easy to see the changes at the ridge, channels and gable edges.

The job, in photographs

From first look to finishing details

Extension gable roof edge before dry verge installation in Clonsilla
01 / BeforeBefore: the exposed tile ends along the extension's sloping roof edge.
Existing extension ridge caps and tiled roof before repointing
02 / BeforeBefore: the ridge line and adjoining roof channel, prior to the repairs.
Worn mortar around extension ridge caps before repair in Clonsilla
03 / BeforeBefore: worn mortar around the ridge caps, which cover the top joint between the roof slopes.
Close view of existing ridge mortar and cap joints on the extension
04 / BeforeBefore: a closer look at the ridge joints and the exposed mortar beneath the caps.
Leaves and moss in the roof channel beside an extension rooflight
05 / BeforeBefore: leaves and moss collected in the channel beside the rooflight and wall.
Debris beside existing tiles and flashing along the extension roof channel
06 / BeforeBefore: debris along the channel and existing flashing, the metal that helps keep water out at roof junctions.
Close view of debris below flashing at an extension roof junction
07 / BeforeBefore: debris and an overlapping flashing detail at the roof junction.
Existing roof ridge and wall junction with debris beside the rooflight
08 / BeforeBefore: the junction near the wall and rooflight, with the neighbouring dry verge visible beyond.
Extension roof channel and adjoining flat roof before junction repairs
09 / BeforeBefore: the channel between the tiled extension and the adjoining flat roof area.
Wider view of the extension channel and roof junction before sealing
10 / BeforeBefore: a wider view of the roof junctions that formed part of the repair scope.
Cleared roof junction showing existing flashing beneath the capping
11 / Work in progressDuring: a cleared section showing the existing flashing before the waterproofing finish.
Roof channel cleared for sealing with roofing tools beside it
12 / Work in progressDuring: the channel cleared for inspection and sealing, with tools and sealant ready for use.
Extension ridge and wall junction during repair work in Clonsilla
13 / Work in progressDuring: the ridge and surrounding roof junctions as work progressed.
Renewed ridge pointing on the extension with waterproofing materials nearby
14 / Work in progressDuring: the renewed mortar around the ridge caps, with further junction work in progress.
Fresh pointing at the end of the extension ridge beside dry verge covers
15 / CompletedAfter: fresh mortar at the ridge end and protective dry verge covers along the outer edge.
Repointed extension ridge and waterproofed channel beside rooflights
16 / CompletedAfter: the renewed ridge pointing and coated channel beside the rooflights.
Finished ridge pointing and waterproofed extension roof channel in Clonsilla
17 / CompletedAfter: the repaired ridge line and waterproofed roof channel alongside the existing rooflights.
Completed grey dry verge units along the extension gable edge
18 / CompletedAfter: a continuous line of grey dry verge covers protecting the exposed tile ends.
Extension gable with fitted grey dry verge covers in Clonsilla
19 / CompletedAfter: the fitted dry verge along the gable edge, viewed from ground level.

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