The Genius Roof Hallhook (10 pack) is a patented, permanent and fail-safe device for refitting a slate when its original nail holes cannot be accessed. Invented by Jimmy Hall, a slater and tiler with 40 years' experience, Hallhook was developed to solve the practical problems he encountered with every slate repair method already on the market: visible plastic fixings, flimsy metal clips, and slate hooks that require trimming the slate head and losing head lap that a building inspector may not accept.
Hallhook is a secret fixing — once installed, it is completely hidden beneath the slate, giving a clean, permanent repair with no visible hardware and no loss of head lap. It is used for general slate repair, after solar panel bracket mounting, after roof light or window installation, after installing slate vents, and on conservation and heritage buildings where an unobtrusive fixing is essential.
Secret Fixing
Fully Concealed
40 Years
Inventor's Trade Experience
75-100mm
Compatible Head Lap
Please Note: Hallhook only works on hip-holed slates and on head laps of not less than 75mm and not greater than 100mm. Confirm your slate's hole pattern and head lap before relying on Hallhook for a repair.
Patented Secret Fixing
Protected under patent GB2473637, Hallhook is completely concealed once installed, leaving no visible hardware on the finished roof — unlike plastic clips or exposed metal fixings.
Designed by a Working Slater
Developed by Jimmy Hall, a slater and tiler for 40 years, specifically to address the shortcomings he encountered first-hand with existing slate repair products.
No Loss of Head Lap
Unlike a slate hook, which requires trimming the slate head and can reduce head lap below what a building inspector will accept, Hallhook needs no such trimming.
Fast, Controlled Installation
Used together with the hookpull tool, Hallhook lets an installer draw the slate firmly into position for a controlled, consistent finish.
Multiple Repair Applications
Suited to general slate repair, refitting slates after solar panel bracket mounting, after roof light or window installation, and after installing slate vents.
Suited to Conservation Work
Its fully concealed fixing makes Hallhook well suited to conservation and heritage buildings, where an unobtrusive repair is often a requirement.
| Product Details |
| Manufacturer |
Genius Roof Solutions (Hallclip) |
| Part Number |
GEN-SLATE-HOOKS |
| Product Name |
Hallhook |
| Pack Quantity |
10 Hallhooks |
| Patent Number |
GB2473637 |
| Compatibility & Use |
| Slate Requirement |
Hip-holed slates only |
| Compatible Head Lap |
Not less than 75mm and not greater than 100mm |
| Typical Applications |
General slate repair, post-bracket mounting slate refitting, post-window/rooflight installation, slate vent installation, conservation and heritage buildings |
| Recommended Companion Tool |
Hookpull tool (for drawing the slate into position) |
Good to Know: For a typical 16-bracket solar installation, expect to need approximately 2.2 Hallhooks per bracket on average — around 37 Hallhooks in total, meaning 4 packs of 10 (40 Hallhooks) would be needed.
What is a Hallhook used for?
Hallhook is used to refit a slate when its original nail holes are not accessible — for example after fitting a solar panel bracket, a roof light, or a slate vent, or during general slate repair work.
Why is it called a secret fixing?
Once installed, Hallhook is completely concealed beneath the slate, leaving no visible hardware on the finished roof, unlike plastic clips or exposed metal fixings.
What head lap does Hallhook work with?
Hallhook is designed for head laps of not less than 75mm and not greater than 100mm, and only works on hip-holed slates.
Do I need any other tools to install a Hallhook?
A hookpull tool is used alongside the Hallhook to draw the slate firmly into position during installation.
Who invented the Hallhook?
Hallhook was invented by Jimmy Hall, a slater and tiler with 40 years' trade experience, in response to the shortcomings he found in every slate repair product already on the market.
How many Hallhooks will I need for a solar installation?
As a guide, expect around 2.2 Hallhooks per bracket on average. For a 16-bracket installation this is approximately 37 Hallhooks, meaning 4 packs of 10 would typically be needed.
