The higher the number, the wider your teeth will be. Here is an example of the plastic molded zippers and their different size teeth. And another example, this time with nylon coil zippers: The higher the number, the wider the coil. It's that simple! I hope this helps you determine the right zipper for your project.
1 The cost to repair a chimney crown will depend on the size of the chimney and how easy it is to access the chimney. 2  Depending on the severity of the job, the average cost of chimney crown repair will range anywhere from $400 to as much as $2,200. If the chimney crown is extensively damaged, it will often have to be rebuilt. 2  If this is the case, you will be looking at a price closer to that $2,000 range. 3  However, if the chimney only has smaller hairline cracks, then the repair could be as little as $400.
The average cost to repoint a chimney is typically around Â£300 for a small chimney with easy access on a low roof. A chimney on the gable end of a semi-detached house is expected to cost Â£800 due to scaffolding costs. Repointing a large chimney stack in the centre of a roof is the most expensive, typically around Â£1200. This average price can vary greatly depending on location, amount of scaffolding, type of chimney, and whether the chimney is at the end or middle of the roof, as well as if it's at eaves or ridge height.