Web Scraper Cloud is a premium service that enriches Web Scraper with automation features, improves scraped data consistency, is scalable and allows to monitor scraping jobs. It uses sitemaps that are built by using Web Scraper browser extension to run scraping jobs.
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Features
Proxy
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Proxy is used in order to prevent scraper of being blocked by the target site or to access the site from a non-restricted location. By the default, the proxy uses IP addresses located in the US. Other location IP addresses can be requested by contacting support. Scale plan users can integrate third party proxy providers and configure proxy locations as needed.
When the proxy is enabled, the scraper will rotate IP addresses every 5 minutes. If the page fails to load with proxy enabled, scraper changes the IP address and retries to scrape the page.
Other features
Page credits
A page credit represents a single page loaded by the Web Scraper Cloud. For example, if the scraper has to navigate through 100 pages, then 100 page credits will be subtracted from your account. If you are extracting 100 records from a single page, only one page credit will be charged.
Page credits are not subtracted when re-scraping empty or failed pages.
Parallel tasks
A parallel task count represents how many scraping jobs can run at once. If all parallel tasks are in use and new scraping job is started, it will be scheduled and added to a queue whilst waiting for a task to free up. Scraping jobs can be manually stopped and continued to free up a parallel task or change the order in which the scraping jobs will be executed. Parallel active scraping job count and scraping job count in queue can be found in Subscription manager page.
Drivers
Web Scraper Cloud has 2 types of drivers to run scraping jobs on:
Fulldriver - loads the page the same way as Web Scraper browser extension. All assets are loaded and JavaScript is executed before data extraction starts;Fastdriver - doesn't execute JavaScript in the page. Data is extracted from raw HTML. The page loads faster than withFulldriver or Web Scraper browser extension.
Progress monitoring
In the scraping job table views you can track the progress of each scraping job:
- Scraped pages - scraped page count and total scheduled page count.
- Scraped record count - data rows extracted.
- Failed pages - pages that loaded with 4xx or 5xx response code or didn't load at all.
- Empty pages - pages that loaded successfully but selectors didn't extract any data.
Our built-in fail-over system automatically re-scrapes any empty and failed pages. If empty and/or failed pages are still present after the scraping job has finished, it can be continued manually in scraping job list view.
Scraping job inspection and troubleshooting
When troubleshooting a scraping job, a list of empty and failed pages with screenshots (only for Full driver) can be found by navigating to scraping job Inspect page from the scraping job listview. Details tab in scraping job Inspect page contains scraping job configuration with sitemap and scraping job IDs and scraping duration. Scraping duration represents time the scraper is actually scraping the site without anystatus changes and queue times.
Additionally, a performance graph is available while the scraping job is running. Data in this graph is kept for 7 days. It can be used to monitor the activity of the scraping job and to estimate the time necessary until the full completion.The graph shows these values in 5-minute intervals:
- Scheduled pages;
- Executed pages;
- Records scraped;
- Empty pages;
Failed pages.
Limits
- Start URL limit - 20'000.
- Selector limit - 100.
- Data extraction execution time from a single URL - 15 minutes. Can be reached by using scroll down selector on infinite scroll down or element click selector. If the timeout is reached, no data will be scraped from that page.
Difference between scraping on Web Scraper Cloud and Web Scraper browser extension
| Web Scraper Cloud | Web Scraper browser extension |
|---|---|
| Consistent site accessibility while scraping. Automatic failover, IP address rotation and data extraction retry mechanisms decreases the chance of the scraper access getting blocked. | Limited access. Only sites that you can access via your browser can be scraped. For small data extraction volumes this is good enough. |
| Scraped data is stored in cloud storage for all scraping jobs within data retention period. | Only data from the latest scraping job is stored in browsers's local storage. |
| Images are not loaded while scraping. This decreases page load time as well as decreases transferred data for custom proxy users. | Images are loaded while scraping. |
| URLs are traversed in pseudo random order. This ensures the most recent data is being scraped when crawling larger sites. | URLs are traversed in last in first out order on how they were discovered. This will discover the initial records sooner but won't decrease the total time required to scrape the site. |
Are you thinking of having your roof tiles jet washed? Think again.
As stated by several roof tile manufacturers and the UK’s Trading Standards organization, pressure washers CAN damage roof tiles, strip the surface granules from the tiles and SHORTEN tile life expectancy. There is also a risk of flooding to the loft space.
Read more about why pressure washing a roof is a very stupid thing to do
Roof cleaning can be achieved by manually removing any excess moss and then applying the correct chemicals to the tiles. This approach doesn’t involve any water (no mess!) and won’t damage the tiles. Any individual tiles that are damaged during this process can be replaced cheaply as roof tiles are not that costly to replace if all the scaffold and access equipment is already in place.
It does involve using some chemicals (such as BAC50) and also a good dose of patience!
Roof Cleaning by Using the Correct Chemicals
One of the most gentle yet effective ways to remove roof moss and clean the roof is by way of scraping. A normal 9″ trowel is suitable, if your roofing contractor chooses a dry day any moss will flake off the roof much easier and there won’t be any scratch marks on the tiles. This approach is recommended by Forticrete who are one of several roof tile producers in the United Kingdom.
If you are concerned about scuff marks to the tiles then a rubber scraper and stiff brush can be used. Remember – with this method there is no damage to the tiles and no flood risk, unlike other roof cleaning methods such as high-powered pressure washing.
Look at the photo below, the moss was removed with nothing more than a trowel and a hand brush, the difference compared to the mossy section of roof is striking.
Roof cleaning doesn’t need to involve power jet washing.
This photo was even taken before any chemicals were applied – what a difference! As you can see, there is no damage to the tiles, no scratch marks and the tiles have not been dislodged by the process.
So Why Use Chemicals?
If you apply a fungicide/moss killer after the moss has been scraped off, it will soak into the tile and more importantly into the overlaps of the tiles and kill off any tiny moss spores. It will also kill off lichen and other organic growth on the tiles. This roof cleaning process can take some time after the excess moss is initially removed but there is no damage to the surface of the tile.
The application of roof cleaning chemicals will also prevent the moss from growing back for several years.
As a bonus, this chemical will also kill lichen, so those black marks on the tiles will fade away a few weeks after the treatment.
Which Chemicals are Recommended?
RoofCoatingScam recommends the following moss treatment chemical for roof tiles, paths, patios, fence panels, driveways and most hard surfaces:
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No Pressure Washing. No Flood Risk. No Expensive (and Useless) Roof Coatings
As stated in other pages, roof coatings are often an expensive and short term approach to roof renovation/roof cleaning. There is a real flood risk, the coatings often look terrible after a few years and they being mis-sold by many many companies in the United Kingdom.
The manual approach to removing moss and applying a chemical maybe considered an old fashioned roof cleaning method but it is time proven and you certainly won’t have to worry about paint peeling off the tiles.
Did I mention that manually removing the moss/applying a fungicide is often the cheapest cleaning method?
Expect to pay around £500 for a semi detached house in Southern England. Compare that to £2000 for a roof cleaning and coating.
Roof cleaning without jet washing
Roof moss removal in progress – no power washing tools used
Roof demossed, no mess, no leaks, cheap and affordable
How Long Does the Moss Killer Last?
Assuming that the roof isn’t under tree cover, the moss shouldn’t grow back for about 3 years, after 4 years there will be light growth.
For this reason, the homeowner should instruct a roofing company to re-apply the chemical every 3 years, thus preventing any moss growth and keeping the roof looking clean.
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Moss killing chemicals are not expensive, expect to pay around £30 for enough to treat a semi detached property. A backpack sprayer costs around £25 and the work takes around an hour.
If you purchase a more expensive backpack sprayer (Hozelock 12 or 16 litre) then you will find they have a very long reach, about 6 metres! That is enough to reach the top of the roof from access towers erected to gutter height.
So once the moss is initially removed nobody ever needs to get on the roof again. This reduces the amount of foot traffic on the roof tiles. Remove the moss once, re-apply the chemicals from gutter height with a sprayer every few years – simple and cost effective!
This type of work is often carried out by traditional roofing contractors, although few roof cleaning/coating companies recommend this approach as it doesn’t involve pressure washers and expensive roof coatings/sealants.
It is possible to complete a roof cleaning project without pressure washing, but the chemicals do take a little time to work. Remember: the “dirt” you see on a roof is usually moss and lichen which can be treated and prevented with chemicals.
Can a Moss Killer be Applied Before the Moss is Removed?
This is a common question, can/should a moss killing chemical be applied to the roof before the moss is removed?
The answer is no.
First, you would need much more of the chemical as the moss would soak it up.
Second, thick layers of moss will prevent the chemical from soaking into the tile/overlaps.
Third, if you were thinking of applying the chemical instead of manually removing the moss with a scraper, then you would have a big problem – the dead moss would gradually wash down into the gutters and block them. It could take months if not years for all the moss to wash off the roof. Your gutters would need frequent cleaning and even then they are still likely to become blocked.
Advice From Tile Manufacturers
Marley Eternit, one of the largest roof tile manufacturers in the United Kingdom responded to an email enquiry about how to clean their popular “Double Roman” type roof tile with the following statement:
We DO NOT recommend pressure washing your roof covering.
Forticrete, which manufacturers a variety of concrete tiles for the UK market responded to a similar request with the following statements:
Removal of moss should be done manually off proper roof access equipment to protect the tiles and operators.
This should be done with a scraper and stiff hand brush.
They added:
Power washing the tiles will remove fines in the concrete which will affect the lifespan of the tiles…. As a manufacturer of concrete roof tiles we would not advocate power washing or recoating tiles as this would invalidate any guarantee.
Which Chemicals are Best?
As we have previously stated, in most cases moss will not damage the roof tiles but can block gutters and drainage points. On certain roofs, such as those with a very shallow pitch, moss can potentially reduce the flow of water off the roof.
If this is the case (and very few roofs suffer from this issue) then gently removing the excess moss via traditional methods and treating the tiles/remaining moss with a fungicide is the best option.
Try any of the moss killers listed here, they can be used on tiles, patios and driveways etc. I have used all of them previously.
As general advice: RoofCoatingScam does not recommend regular roof cleaning just for the sake of improving the appearance of the roof. Foot traffic can damage roof tiles so we only recommend roof cleaning/de-mossing when it is absolutely necessary, ie when the moss is preventing water from draining off the roof.
Further Reading
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Cost and price guides for roofing related work can be found at Roofer’s Rates
Can You Help?
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(Page updated February 2014)